Datasheet
Table Of Contents
- Analog Features:
- LCD Driver and Keypad Interface Features:
- Flexible Oscillator Structure:
- Low-Power Features:
- Peripheral Highlights:
- Special Microcontroller Features:
- Target Applications:
- Pin Diagram
- Typical Application Circuit: Single-Phase Power Meter
- Table of Contents
- Most Current Data Sheet
- Errata
- Customer Notification System
- 1.0 Device Overview
- 2.0 Guidelines for Getting Started with PIC18FJ Microcontrollers
- 3.0 Oscillator Configurations
- 3.1 Oscillator Types
- 3.2 Control Registers
- 3.3 Clock Sources and Oscillator Switching
- 3.4 External Oscillator Modes
- 3.5 Internal Oscillator Block
- 3.6 Effects of Power-Managed Modes on the Various Clock Sources
- 3.7 Power-up Delays
- 4.0 Power-Managed Modes
- 5.0 Reset
- 6.0 Memory Organization
- 6.1 Program Memory Organization
- 6.2 PIC18 Instruction Cycle
- 6.3 Data Memory Organization
- 6.4 Data Addressing Modes
- 6.5 Program Memory and the Extended Instruction Set
- 6.6 Data Memory and the Extended Instruction Set
- 7.0 Flash Program Memory
- 7.1 Table Reads and Table Writes
- 7.2 Control Registers
- 7.3 Reading the Flash Program Memory
- 7.4 Erasing Flash Program Memory
- 7.5 Writing to Flash Program Memory
- 7.6 Flash Program Operation During Code Protection
- 8.0 8 X 8 Hardware Multiplier
- 8.1 Introduction
- 8.2 Operation
- EXAMPLE 8-1: 8 x 8 Unsigned Multiply Routine
- EXAMPLE 8-2: 8 x 8 Signed Multiply Routine
- TABLE 8-1: Performance Comparison for Various Multiply Operations
- EQUATION 8-1: 16 x 16 Unsigned Multiplication Algorithm
- EXAMPLE 8-3: 16 x 16 Unsigned Multiply Routine
- EQUATION 8-2: 16 x 16 Signed Multiplication Algorithm
- EXAMPLE 8-4: 16 x 16 Signed Multiply Routine
- 9.0 Interrupts
- 10.0 I/O Ports
- FIGURE 10-1: Generic I/O Port Operation
- 10.1 I/O Port Pin Capabilities
- 10.2 PORTA, TRISA and LATA Registers
- 10.3 PORTB, TRISB and LATB Registers
- 10.4 PORTC, TRISC and LATC Registers
- 10.5 PORTD, TRISD and LATD Registers
- 10.6 PORTE, TRISE and LATE Registers
- 10.7 PORTF, LATF and TRISF Registers
- 10.8 PORTG, TRISG and LATG Registers
- 11.0 Timer0 Module
- 12.0 Timer1 Module
- 13.0 Timer2 Module
- 14.0 Timer3 Module
- 15.0 Real-Time Clock and Calendar (RTCC)
- FIGURE 15-1: RTCC Block Diagram
- 15.1 RTCC Module Registers
- RTCC Control Registers
- RTCC Value Registers
- Alarm Value Registers
- 15.1.1 RTCC Control Registers
- 15.1.2 RTCVALH and RTCVALL Register Mappings
- Register 15-6: Reserved Register
- Register 15-7: Year: Year Value Register(1)
- Register 15-8: MontH: Month Value Register(1)
- Register 15-9: Day: Day Value Register(1)
- Register 15-10: Weekday: Weekday Value Register(1)
- Register 15-11: Hour: Hour Value Register(1)
- Register 15-12: MINUTE: Minute Value Register
- Register 15-13: SECOND: Second Value Register
- 15.1.3 ALRMVALH and ALRMVALL Register Mappings
- Register 15-14: ALRMMNTH: Alarm Month Value Register(1)
- Register 15-15: ALRMDAY: Alarm Day Value Register(1)
- Register 15-16: ALRMWd: Alarm Weekday Value Register(1)
- Register 15-17: ALRMHr: Alarm Hours Value Register(1)
- Register 15-18: ALRMMIN: Alarm Minutes Value Register
- Register 15-19: ALRMSEC: Alarm Seconds Value Register
- 15.1.4 RTCEN Bit Write
- 15.2 Operation
- 15.3 Alarm
- 15.4 Sleep Mode
- 15.5 Reset
- 15.6 Register Maps
- 16.0 Capture/Compare/PWM (CCP) Modules
- 17.0 Liquid Crystal Display (LCD) Driver Module
- FIGURE 17-1: LCD Driver Module Block Diagram
- 17.1 LCD Registers
- 17.2 LCD Clock Source
- 17.3 LCD Bias Generation
- 17.4 LCD Multiplex Types
- 17.5 Segment Enables
- 17.6 Pixel Control
- 17.7 LCD Frame Frequency
- 17.8 LCD Waveform Generation
- FIGURE 17-6: Type-A/Type-B Waveforms in Static Drive
- FIGURE 17-7: Type-A Waveforms in 1/2 MUX, 1/2 Bias Drive
- FIGURE 17-8: Type-B Waveforms in 1/2 MUX, 1/2 Bias Drive
- FIGURE 17-9: Type-A Waveforms in 1/2 MUX, 1/3 Bias Drive
- FIGURE 17-10: Type-B Waveforms in 1/2 MUX, 1/3 Bias Drive
- FIGURE 17-11: Type-A Waveforms in 1/3 MUX, 1/2 Bias Drive
- FIGURE 17-12: Type-B Waveforms in 1/3 MUX, 1/2 Bias Drive
- FIGURE 17-13: Type-A Waveforms in 1/3 MUX, 1/3 Bias Drive
- FIGURE 17-14: Type-B Waveforms in 1/3 MUX, 1/3 Bias Drive
- FIGURE 17-15: Type-A Waveforms in 1/4 MUX, 1/3 Bias Drive
- FIGURE 17-16: Type-B Waveforms in 1/4 MUX, 1/3 Bias Drive
- 17.9 LCD Interrupts
- 17.10 Operation During Sleep
- 17.11 Configuring the LCD Module
- 18.0 Master Synchronous Serial Port (MSSP) Module
- 18.1 Master SSP (MSSP) Module Overview
- 18.2 Control Registers
- 18.3 SPI Mode
- FIGURE 18-1: MSSP Block Diagram (SPI Mode)
- 18.3.1 Registers
- 18.3.2 Operation
- 18.3.3 Enabling SPI I/O
- 18.3.4 Open-Drain Output Option
- 18.3.5 Typical Connection
- 18.3.6 Master Mode
- 18.3.7 Slave Mode
- 18.3.8 Slave Select Synchronization
- 18.3.9 Operation in Power-Managed Modes
- 18.3.10 Effects of a Reset
- 18.3.11 Bus Mode Compatibility
- 18.4 I2C Mode
- FIGURE 18-7: MSSP Block Diagram (I2C™ Mode)
- 18.4.1 Registers
- 18.4.2 Operation
- 18.4.3 Slave Mode
- EXAMPLE 18-2: Address Masking Examples
- FIGURE 18-8: I2C™ Slave Mode Timing with SEN = 0 (Reception, 7-bit Addressing)
- FIGURE 18-9: I2C™ Slave Mode Timing with SEN = 0 and ADMSK<5:1> = 01011 (Reception, 7-bit Addressing)
- FIGURE 18-10: I2C™ Slave Mode Timing (Transmission, 7-bit Addressing)
- FIGURE 18-11: I2C™ Slave Mode Timing with SEN = 0 (Reception, 10-bit Addressing)
- FIGURE 18-12: I2C™ Slave Mode Timing with SEN = 0 and ADMSK<5:1> = 01001 (Reception, 10-bit Addressing)
- FIGURE 18-13: I2C™ Slave Mode Timing (Transmission, 10-bit Addressing)
- 18.4.4 Clock Stretching
- 18.4.5 General Call Address Support
- 18.4.6 Master Mode
- 18.4.7 Baud Rate
- 18.4.8 I2C Master Mode Start Condition Timing
- 18.4.9 I2C Master Mode Repeated Start Condition Timing
- 18.4.10 I2C Master Mode Transmission
- 18.4.11 I2C Master Mode Reception
- 18.4.12 Acknowledge Sequence Timing
- 18.4.13 Stop Condition Timing
- 18.4.14 Sleep Operation
- 18.4.15 Effects of a Reset
- 18.4.16 Multi-Master Mode
- 18.4.17 Multi -Master Communication, Bus Collision and Bus Arbitration
- FIGURE 18-27: Bus Collision Timing for Transmit and Acknowledge
- FIGURE 18-28: Bus Collision During Start Condition (SDA Only)
- FIGURE 18-29: Bus Collision During Start Condition (SCL = 0)
- FIGURE 18-30: BRG Reset Due to SDA Arbitration During Start Condition
- FIGURE 18-31: Bus Collision During a Repeated Start Condition (Case 1)
- FIGURE 18-32: Bus Collision During Repeated Start Condition (Case 2)
- FIGURE 18-33: Bus Collision During a Stop Condition (Case 1)
- FIGURE 18-34: Bus Collision During a Stop Condition (Case 2)
- TABLE 18-4: Registers Associated with I2C™ Operation
- 19.0 Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART)
- 19.1 Control Registers
- 19.2 EUSART Baud Rate Generator (BRG)
- 19.3 EUSART Asynchronous Mode
- 19.4 EUSART Synchronous Master Mode
- 19.5 EUSART Synchronous Slave Mode
- 20.0 Addressable Universal Synchronous Asynchronous Receiver Transmitter (AUSART)
- 20.1 Control Registers
- 20.2 AUSART Baud Rate Generator (BRG)
- 20.3 AUSART Asynchronous Mode
- 20.4 AUSART Synchronous Master Mode
- 20.5 AUSART Synchronous Slave Mode
- 21.0 12-Bit Analog-to-Digital Converter (A/D) Module
- Register 21-1: ADCON0: A/D Control Register 0
- Register 21-2: ADCON1: A/D Control Register 1
- Register 21-3: ADCON2: A/D Control Register 2
- FIGURE 21-1: A/D Block Diagram(1,2)
- FIGURE 21-2: Analog Input Model
- 21.1 A/D Acquisition Requirements
- 21.2 Selecting and Configuring Automatic Acquisition Time
- 21.3 Selecting the A/D Conversion Clock
- 21.4 Configuring Analog Port Pins
- 21.5 A/D Conversions
- 21.6 Use of the CCP2 Trigger
- 21.7 A/D Converter Calibration
- 21.8 Operation in Power-Managed Modes
- 22.0 Dual-Channel, 24-Bit Analog Front End (AFE)
- 23.0 Comparator Module
- Register 23-1: CMCON: Comparator Module Control Register
- 23.1 Comparator Configuration
- 23.2 Comparator Operation
- 23.3 Comparator Reference
- 23.4 Comparator Response Time
- 23.5 Comparator Outputs
- 23.6 Comparator Interrupts
- 23.7 Comparator Operation During Sleep
- 23.8 Effects of a Reset
- 23.9 Analog Input Connection Considerations
- 24.0 Comparator Voltage Reference Module
- 25.0 Charge Time Measurement Unit (CTMU)
- FIGURE 25-1: CTMU Block Diagram
- 25.1 CTMU Operation
- 25.2 CTMU Module Initialization
- 25.3 Calibrating the CTMU Module
- 25.4 Measuring Capacitance with the CTMU
- 25.5 Measuring Time with the CTMU Module
- 25.6 Creating a Delay with the CTMU Module
- 25.7 Operation During Sleep/Idle Modes
- 25.8 Effects of a Reset on CTMU
- 25.9 Registers
- 26.0 Special Features of the CPU
- 26.1 Configuration Bits
- 26.1.1 Considerations for Configuring PIC18F87J72 Family Devices
- TABLE 26-1: Mapping of the Flash Configuration Words to the Configuration Registers
- TABLE 26-2: Configuration Bits and Device IDs
- Register 26-1: CONFIG1L: Configuration Register 1 Low (Byte Address 300000h)
- Register 26-2: CONFIG1H: Configuration Register 1 High (Byte Address 300001h)
- Register 26-3: CONFIG2L: Configuration Register 2 Low (Byte Address 300002h)
- Register 26-4: CONFIG2H: Configuration Register 2 High (Byte Address 300003h)
- Register 26-5: CONFIG3L: Configuration Register 3 Low (Byte Address 300004h)
- Register 26-6: CONFIG3H: Configuration Register 3 High (Byte Address 300005h)
- Register 26-7: DEVID1: Device ID Register 1
- Register 26-8: DEVID2: Device ID Register 2
- 26.1.1 Considerations for Configuring PIC18F87J72 Family Devices
- 26.2 Watchdog Timer (WDT)
- 26.3 On-Chip Voltage Regulator
- 26.4 Two-Speed Start-up
- 26.5 Fail-Safe Clock Monitor
- 26.6 Program Verification and Code Protection
- 26.7 In-Circuit Serial Programming
- 26.8 In-Circuit Debugger
- 26.1 Configuration Bits
- 27.0 Instruction Set Summary
- 27.1 Standard Instruction Set
- 27.2 Extended Instruction Set
- 28.0 Development Support
- 28.1 MPLAB Integrated Development Environment Software
- 28.2 MPLAB C Compilers for Various Device Families
- 28.3 HI-TECH C for Various Device Families
- 28.4 MPASM Assembler
- 28.5 MPLINK Object Linker/ MPLIB Object Librarian
- 28.6 MPLAB Assembler, Linker and Librarian for Various Device Families
- 28.7 MPLAB SIM Software Simulator
- 28.8 MPLAB REAL ICE In-Circuit Emulator System
- 28.9 MPLAB ICD 3 In-Circuit Debugger System
- 28.10 PICkit 3 In-Circuit Debugger/ Programmer and PICkit 3 Debug Express
- 28.11 PICkit 2 Development Programmer/Debugger and PICkit 2 Debug Express
- 28.12 MPLAB PM3 Device Programmer
- 28.13 Demonstration/Development Boards, Evaluation Kits, and Starter Kits
- 29.0 Electrical Characteristics
- Absolute Maximum Ratings(†)
- 29.1 DC Characteristics: Supply Voltage PIC18F87J72 Family (Industrial)
- 29.2 DC Characteristics: Power-Down and Supply Current PIC18F87J72 Family (Industrial)
- 29.3 DC Characteristics: PIC18F87J72 Family (Industrial)
- 29.4 DC Characteristics: CTMU Current Source Specifications
- 29.5 AC (Timing) Characteristics
- 29.5.1 Timing Parameter Symbology
- 29.5.2 Timing Conditions
- 29.5.3 Timing Diagrams and Specifications
- FIGURE 29-4: External Clock Timing
- TABLE 29-7: External Clock Timing Requirements
- TABLE 29-8: PLL Clock Timing Specifications (Vdd = 2.15V to 3.6V)
- TABLE 29-9: Internal RC Accuracy (INTOSC and INTRC Sources)
- FIGURE 29-5: CLKO and I/O Timing
- TABLE 29-10: CLKO and I/O Timing Requirements
- FIGURE 29-6: Reset, Watchdog Timer, Oscillator Start-up Timer and Power-up Timer Timing
- TABLE 29-11: Reset, Watchdog Timer, Oscillator Start-up Timer, Power-up Timer and Brown-out Reset Requirements
- FIGURE 29-7: Timer0 and Timer1 External Clock Timings
- TABLE 29-12: Timer0 and Timer1 External Clock Requirements
- FIGURE 29-8: Capture/Compare/PWM Timings (CCP1, CCP2 Modules)
- TABLE 29-13: Capture/Compare/PWM Requirements (CCP1, CCP2 Modules)
- FIGURE 29-9: Example SPI Master Mode Timing (CKE = 0)
- TABLE 29-14: Example SPI Mode Requirements (Master Mode, Cke = 0)
- FIGURE 29-10: Example SPI Master Mode Timing (CKE = 1)
- TABLE 29-15: Example SPI Mode Requirements (Master Mode, CKE = 1)
- FIGURE 29-11: Example SPI Slave Mode Timing (CKE = 0)
- TABLE 29-16: Example SPI Mode Requirements (Slave Mode Timing, CKE = 0)
- FIGURE 29-12: Example SPI Slave Mode Timing (CKE = 1)
- TABLE 29-17: Example SPI Slave Mode Requirements (CKE = 1)
- FIGURE 29-13: I2C™ Bus Start/Stop Bits Timing
- TABLE 29-18: I2C™ Bus Start/Stop Bits Requirements (Slave Mode)
- FIGURE 29-14: I2C™ Bus Data Timing
- TABLE 29-19: I2C™ Bus Data Requirements (Slave Mode)
- FIGURE 29-15: MSSP I2C™ Bus Start/Stop Bits Timing Waveforms
- TABLE 29-20: MSSP I2C™ Bus Start/Stop Bits Requirements
- FIGURE 29-16: MSSP I2C™ Bus Data Timing
- TABLE 29-21: MSSP I2C™ Bus Data Requirements
- FIGURE 29-17: EUSART/AUSART Synchronous Transmission (Master/Slave) Timing
- TABLE 29-22: EUSART/AUSART Synchronous Transmission Requirements
- FIGURE 29-18: EUSART/AUSART Synchronous Receive (Master/Slave) Timing
- TABLE 29-23: EUSART/AUSART Synchronous Receive Requirements
- TABLE 29-24: A/D Converter Characteristics: PIC18F87J72 Family (Industrial)
- FIGURE 29-19: A/D Conversion Timing
- TABLE 29-25: A/D Conversion Requirements
- TABLE 29-26: Dual-Channel AFE Electrical Characteristics
- TABLE 29-27: Dual-Channel AFE Serial Peripheral Interface Specifications
- FIGURE 29-20: Serial Output Timing Diagram
- FIGURE 29-21: Serial Input Timing Diagram
- FIGURE 29-22: Data Ready Pulse Timing Diagram
- FIGURE 29-23: Specific Timing Diagrams
- 30.0 Packaging Information
- Appendix A: Revision History
- Appendix B: Dual-Channel, 24-Bit AFE Reference
- TABLE B-1: OVERSAMPLING RATIO SETTINGS
- TABLE B-2: Device data rates in function of mclk, osr AND PRESCALE
- TABLE B-3: OVERSAMPLING RATIO SETTINGS
- Step 1
- Step 2
- TABLE B-4: PGA Configuration Setting
- TABLE B-5: adc RESOLUTION vs. osr
- TABLE B-6: OSR = 256 output code examples
- TABLE B-7: OSR = 128 output code examples
- TABLE B-8: OSR = 64 output code examples
- TABLE B-9: OSR = 32 output code examples
- TABLE B-10: Phase Values With MCLK = 4 MHz, OSR = 256
- TABLE B-11: Register Groups
- TABLE B-12: Register Types
- TABLE B-13: Register map
- TABLE B-14: Register Map Grouping for Continuous read modes
- TABLE B-15: Phase Encoding Resolution By Oversampling Ratio
- INDEX
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2010 Microchip Technology Inc. Preliminary DS39979A-page 69
PIC18F87J72 FAMILY
SPBRGH1 EUSART Baud Rate Generator High Byte
0000 0000
53, 243
BAUDCON1 ABDOVF RCMT RXDTP TXCKP BRG16
—WUEABDEN
0100 0-00
53, 242
LCDDATA22
— — — — — — — S32C3
xxxx xxxx
53, 171
LCDDATA21 S31C3 S30C3 S29C3 S28C3 S27C3 S26C3 S25C3 S24C3
xxxx xxxx
53, 171
LCDDATA20 S23C3 S22C3 S21C3 S20C3 S19C3 S18C3 S17C3 S16C3
xxxx xxxx
53, 171
LCDDATA19 S15C3 S14C3 S13C3 S12C3 S11C3 S10C3 S09C3 S08C3
xxxx xxxx
53, 171
LCDDATA18 S07C3 S06C3 S05C3 S04C3 S03C3 S02C3 S01C3 S00C3
xxxx xxxx
53, 171
LCDDATA16
— — — — — — — S32C2
xxxx xxxx
53, 171
LCDDATA15 S31C2 S30C2 S29C2 S28C2 S27C2 S26C2 S25C2 S24C2
xxxx xxxx
53, 171
LCDDATA14 S23C2 S22C2 S21C2 S20C2 S19C2 S18C2 S17C2 S16C2
xxxx xxxx
53, 171
LCDDATA13 S15C2 S14C2 S13C2 S12C2 S11C2 S10C2 S09C2 S08C2
xxxx xxxx
53, 171
LCDDATA12 S07C2 S06C2 S05C2 S04C2 S03C2 S02C2 S01C2 S00C2
xxxx xxxx
53, 171
LCDDATA10
— — — — — — — S32C1
xxxx xxxx
53, 171
LCDDATA9 S31C1 S30C1 S29C1 S28C1 S27C1 S26C1 S25C1 S24C1
xxxx xxxx
53, 171
LCDDATA8 S23C1 S22C1 S21C1 S20C1 S19C1 S18C1 S17C1 S16C1
xxxx xxxx
53, 171
LCDDATA7 S15C1 S14C1 S13C1 S12C1 S11C1 S10C1 S09C1 S08C1
xxxx xxxx
53, 171
LCDDATA6 S07C1 S06C1 S05C1 S04C1 S03C1 S02C1 S01C1 S00C1
xxxx xxxx
53, 171
CCPR1H Capture/Compare/PWM Register 1 High Byte
xxxx xxxx
53, 158
CCPR1L Capture/Compare/PWM Register 1 Low Byte
xxxx xxxx
53, 158
CCP1CON
— — DC1B1 DC1B0 CCP1M3 CCP1M2 CCP1M1 CCP1M0
--00 0000
53, 157
CCPR2H Capture/Compare/PWM Register 2 High Byte
xxxx xxxx
53, 158
CCPR2L Capture/Compare/PWM Register 2 Low Byte
xxxx xxxx
53, 158
CCP2CON
— — DC2B1 DC2B0 CCP2M3 CCP2M2 CCP2M1 CCP2M0
--00 0000
53, 157
SPBRG2 AUSART Baud Rate Generator Register
0000 0000
54, 262
RCREG2 AUSART Receive Register
0000 0000
54, 267
TXREG2 AUSART Transmit Register
0000 0000
54, 265
TXSTA2 CSRC TX9 TXEN SYNC
— BRGH TRMT TX9D
0000 -010
54, 260
RCSTA2 SPEN RX9 SREN CREN ADDEN FERR OERR RX9D
0000 000x
54, 261
RTCCFG RTCEN
— RTCWREN RTCSYNC HALFSEC RTCOE RTCPTR1 RTCPTR0
0-00 0000
54, 141
RTCCAL CAL7 CAL6 CAL5 CAL4 CAL3 CAL2 CAL1 CAL0
0000 0000
54, 142
RTCVALH RTCC Value High Register Window based on RTCPTR<1:0>
xxxx xxxx
54, 144
RTCVALL RTCC Value Low Register Window based on RTCPTR<1:0>
xxxx xxxx
54, 144
ALRMCFG ALRMEN CHIME AMASK3 AMASK2 AMASK1 AMASK0 ALRMPTR1 ALRMPTR0
0000 0000
54, 143
ALRMRPT ARPT7 ARPT6 ARPT5 ARPT4 ARPT3 ARPT2 ARPT1 ARPT0
0000 0000
54, 144
ALRMVALH Alarm Value High Register Window based on ALRMPTR<1:0>
xxxx xxxx
54, 147
ALRMVALL Alarm Value Low Register Window based on ALRMPTR<1:0>
xxxx xxxx
54, 147
CTMUCONH CTMUEN
— CTMUSIDL TGEN EDGEN EDGSEQEN IDISSEN CTTRIG
0-00 0000
54, 315
CTMUCONL EDG2POL EDG2SEL1 EDG2SEL0 EDG1POL EDG1SEL1 EDG1SEL0 EDG2STAT EDG1STAT
0000 0000
54, 316
CTMUICON ITRIM5 ITRIM4 ITRIM3 ITRIM2 ITRIM1 ITRIM0 IRNG1 IRNG0
0000 0000
54, 317
PADCFG1
— — — — — RTSECSEL1 RTSECSEL0 —
---- -00-
54, 142
TABLE 6-3: PIC18F87J72 FAMILY REGISTER FILE SUMMARY (CONTINUED)
File Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Value on
POR, BOR
Details on
page
Legend:
x
= unknown,
u
= unchanged,
-
= unimplemented,
q
= value depends on condition,
r
= reserved, do not modify
Note 1:
Bit 21 of the PC is only available in Test mode and Serial Programming modes.
2:
Alternate names and definitions for these bits when the MSSP module is operating in I
2
C™ Slave mode. See
Section 18.4.3.2 “Address
Masking”
for details.
3:
The PLLEN bit is only available in specific oscillator configurations; otherwise, it is disabled and reads as ‘
0
’. See
Section 3.4.3 “PLL
Frequency Multiplier”
for details.
4:
RA<7:6> and their associated latch and direction bits are configured as port pins only when the internal oscillator is selected as the default
clock source (FOSC2 Configuration bit =
0
); otherwise, they are disabled and these bits read as ‘
0
’.