Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller UQFN 28 (4x4) 8-Bit 20 MHz I/O number 25

Table Of Contents

TABLE 1: 28/40/44-Pin Allocation Table (PIC16LF1904/6/7)
1.0 Device Overview
- TABLE 1-1: Device Peripheral Summary
- FIGURE 1-1: PIC16LF1904/6/7 Block Diagram
- TABLE 1-2: PIC16LF1904/6/7 Pinout Description
2.0 Enhanced Mid-range CPU
- FIGURE 2-1: Core Block Diagram
3.0 Memory Organization
- TABLE 3-1: Device Sizes and Addresses
- FIGURE 3-1: Program Memory Map And Stack For PIC16LF1904
- FIGURE 3-2: Program Memory Map And Stack For PIC16LF1906/7
- TABLE 3-2: Core Registers
- Register 3-1: STATUS: STATUS Register
- FIGURE 3-3: Banked Memory Partitioning
- TABLE 3-3: PIC16LF1904/6/7 Memory Map
- TABLE 3-3: PIC16LF1904/6/7 Memory Map (Continued)
- TABLE 3-3: PIC16LF1904/6/7 Memory Map (Continued)
- TABLE 3-4: Core Function Registers Summary
- TABLE 3-5: Special Function Register Summary
- FIGURE 3-4: Loading Of PC In Different Situations
- FIGURE 3-5: Accessing the Stack Example 1
- FIGURE 3-6: Accessing the Stack Example 2
- FIGURE 3-7: Accessing the Stack Example 3
- FIGURE 3-8: Accessing the Stack Example 4
- FIGURE 3-9: Indirect Addressing
- FIGURE 3-10: Traditional Data Memory Map
- FIGURE 3-11: Linear Data Memory Map
- FIGURE 3-12: Program Flash Memory Map
4.0 Device Configuration
- Register 4-1: Configuration Word 1
- Register 4-2: Configuration Word 2
- Register 4-3: DEVICEID: Device ID Register
5.0 Resets
- FIGURE 5-1: Simplified Block Diagram Of On-Chip Reset Circuit
- TABLE 5-1: BOR Operating Modes
- FIGURE 5-2: Brown-Out Situations
- Register 5-1: BORCON: Brown-out Reset Control Register
- TABLE 5-2: MCLR Configuration
- FIGURE 5-3: Reset Start-Up Sequence
- TABLE 5-3: Reset Status Bits and Their Significance
- TABLE 5-4: Reset Condition for Special Registers(2)
- Register 5-2: PCON: Power Control Register
- TABLE 5-5: Summary Of Registers Associated With Resets
6.0 Oscillator Module
- FIGURE 6-1: Simplified PIC® MCU Clock Source Block Diagram
- FIGURE 6-2: External Clock (EC) Mode Operation
- FIGURE 6-3: Quartz Crystal Operation (Secondary Oscillator)
- FIGURE 6-4: Internal Oscillator Switch Timing
- Register 6-1: OSCCON: Oscillator Control Register
- Register 6-2: OSCSTAT: Oscillator Status ReGister
- TABLE 6-1: Summary of Registers Associated with Clock Sources
- TABLE 6-2: Summary of cONFIGURATION wORD with Clock Sources
7.0 Interrupts
- FIGURE 7-1: Interrupt Logic
- FIGURE 7-2: Interrupt Latency
- FIGURE 7-3: INT Pin Interrupt Timing
- Register 7-1: INTCON: Interrupt Control Register
- Register 7-2: PIE1: Peripheral Interrupt Enable Register 1
- Register 7-3: PIE2: Peripheral Interrupt Enable Register 2
- Register 7-4: PIR1: Peripheral Interrupt Request Register 1
- Register 7-5: PIR2: Peripheral Interrupt Request Register 2
- TABLE 7-1: Summary of Registers Associated with Interrupts
8.0 Power-Down Mode (Sleep)
- FIGURE 8-1: Wake-Up From Sleep Through Interrupt
- TABLE 8-1: Summary of Registers Associated with pOWER-dOWN mODE
9.0 Watchdog Timer
- FIGURE 9-1: Watchdog Timer Block Diagram
- TABLE 9-1: WDT Operating Modes
- TABLE 9-2: WDT Clearing Conditions
- Register 9-1: WDTCON: Watchdog Timer Control Register
10.0 Flash Program Memory Control
- TABLE 10-1: Flash Memory Organization By Device
- FIGURE 10-1: Flash Program Memory Read Flowchart
- FIGURE 10-2: Flash Program Memory Read Cycle Execution
- FIGURE 10-3: Flash Program Memory Unlock Sequence Flowchart
- FIGURE 10-4: Flash Program Memory Erase Flowchart
- FIGURE 10-5: Block WRITES to Flash Program Memory With 32 write latches
- FIGURE 10-6: Flash Program Memory Write Flowchart
- FIGURE 10-7: Flash Program Memory Modify Flowchart
- TABLE 10-2: User ID, Device ID and Configuration Word Access (cfgs = 1)
- FIGURE 10-8: Flash Program Memory Verify Flowchart
- Register 10-1: PMDATL: Program Memory Data Low Byte Register
- Register 10-2: PMDATH: Program Memory Data hIGH bYTE Register
- Register 10-3: PMADRL: Program Memory Address Low Byte Register
- Register 10-4: PMADRH: Program Memory Address hIGH bYTE Register
- Register 10-5: PMCON1: Program Memory Control 1 Register
- Register 10-6: PMCON2: Program Memory Control 2 Register
- TABLE 10-3: Summary of Registers Associated with Flash Program Memory
- TABLE 10-4: Summary of cONFIGURATION wORD with Flash Program Memory
11.0 I/O Ports
- TABLE 11-1: Port Availability Per Device
- FIGURE 11-1: Generic I/O Port Operation
- TABLE 11-2: PORTA Output Priority
- Register 11-1: PORTA: PORTA Register
- Register 11-2: TRISA: PORTA Tri-State Register
- Register 11-3: LATA: PORTA Data Latch Register
- Register 11-4: ANSELA: PORTA Analog Select Register
- TABLE 11-3: Summary of Registers Associated with PORTA
- TABLE 11-4: Summary of cONFIGURATION wORD with PORTA
- TABLE 11-5: PORTB Output Priority
- Register 11-5: PORTB: PORTB Register
- Register 11-6: TRISB: PORTB Tri-State Register
- Register 11-7: LATB: PORTB Data Latch Register
- Register 11-8: ANSELB: PORTB Analog Select Register
- Register 11-9: WPUB: WEAK PULL-uP PORTB REGISTER
- TABLE 11-6: Summary of Registers Associated with PORTB
- TABLE 11-7: PORTC Output Priority
- Register 11-10: PORTC: PORTC Register
- Register 11-11: TRISC: PORTC Tri-State Register
- Register 11-12: LATC: PORTC Data Latch Register
- TABLE 11-8: Summary of Registers Associated with PORTC
- TABLE 11-9: PORTD Output Priority
- Register 11-13: PORTD: PORTD Register
- Register 11-14: TRISD: PORTD Tri-State Register
- Register 11-15: LATD: PORTB Data Latch Register
- TABLE 11-10: Summary of Registers Associated with PORTD(1)
- Register 11-16: PORTE: PORTE Register
- Register 11-17: TRISE: PORTE Tri-State Register
- Register 11-18: LATE: PORTE Data Latch Register
- Register 11-19: ANSELE: PORTE Analog Select Register
- Register 11-20: WPUE: WEAK PULL-uP PORTe REGISTER
- TABLE 11-11: Summary of Registers Associated with PORTE
12.0 Interrupt-On-Change
- FIGURE 12-1: Interrupt-On-Change Block Diagram
- Register 12-1: IOCBP: Interrupt-on-Change Positive Edge Register
- Register 12-2: IOCBN: Interrupt-on-Change Negative Edge Register
- Register 12-3: IOCBF: Interrupt-on-Change Flag Register
- TABLE 12-1: Summary of Registers Associated with Interrupt-on-Change
13.0 Fixed Voltage Reference (FVR)
- FIGURE 13-1: Voltage Reference Block Diagram
- TABLE 13-1: Peripherals Requiring the Fixed Voltage Reference (FVR)
- Register 13-1: FVRCON: Fixed Voltage Reference Control Register
- TABLE 13-2: Summary of Registers Associated with Fixed Voltage Reference
14.0 Temperature Indicator Module
- FIGURE 14-1: Temperature Circuit Diagram
- TABLE 14-1: Recommended Vdd vs. Range
15.0 Analog-to-Digital Converter (ADC) Module
- FIGURE 15-1: ADC Block Diagram
- TABLE 15-1: ADC Clock Period (Tad) Vs. Device Operating Frequencies
- FIGURE 15-2: Analog-to-Digital Conversion Tad Cycles
- FIGURE 15-3: 10-Bit A/D Conversion Result Format
- Register 15-1: ADCON0: A/D Control Register 0
- Register 15-2: ADCON1: A/D Control Register 1
- Register 15-3: ADRESH: ADC Result Register High (ADRESH) ADFM = 0
- Register 15-4: ADRESL: ADC Result Register Low (ADRESL) ADFM = 0
- Register 15-5: ADRESH: ADC Result Register High (ADRESH) ADFM = 1
- Register 15-6: ADRESL: ADC Result Register Low (ADRESL) ADFM = 1
- FIGURE 15-4: Analog Input Model
- FIGURE 15-5: ADC Transfer Function
- TABLE 15-2: Summary of Registers Associated with ADC
16.0 Timer0 Module
- FIGURE 16-1: Block Diagram of the Timer0
- Register 16-1: OPTION_REG: OPTION Register
- TABLE 16-1: Summary of Registers Associated with Timer0
17.0 Timer1 Module with Gate Control
- FIGURE 17-1: Timer1 Block Diagram
- TABLE 17-1: Timer1 Enable Selections
- TABLE 17-2: Clock Source Selections
- TABLE 17-3: Timer1 Gate Enable Selections
- TABLE 17-4: Timer1 Gate Sources
- FIGURE 17-2: Timer1 Incrementing Edge
- FIGURE 17-3: Timer1 Gate Enable Mode
- FIGURE 17-4: Timer1 Gate Toggle Mode
- FIGURE 17-5: Timer1 Gate Single-Pulse Mode
- FIGURE 17-6: Timer1 Gate Single-Pulse and Toggle Combined Mode
- Register 17-1: T1CON: Timer1 Control Register
- Register 17-2: T1GCON: Timer1 Gate Control Register
- TABLE 17-5: Summary of Registers Associated with Timer1
18.0 Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART)
- FIGURE 18-1: EUSART Transmit Block Diagram
- FIGURE 18-2: EUSART Receive Block Diagram
- FIGURE 18-3: Asynchronous Transmission
- FIGURE 18-4: Asynchronous Transmission (Back-to-Back)
- TABLE 18-1: Registers Associated with Asynchronous Transmission
- FIGURE 18-5: Asynchronous Reception
- TABLE 18-2: Registers Associated with Asynchronous Reception
- Register 18-1: TXSTA: Transmit Status AND Control REGISTER
- Register 18-2: RCSTA: Receive Status and Control Register
- Register 18-3: BAUDCON: BAUD RATE CONTROL REGISTER
- TABLE 18-3: Baud Rate Formulas
- TABLE 18-4: Registers Associated with Baud Rate Generator
- TABLE 18-5: BAUD Rates for Asynchronous Modes
- TABLE 18-6: BRG Counter Clock Rates
- FIGURE 18-6: Automatic Baud Rate Calibration
- FIGURE 18-7: Auto-Wake-up Bit (WUE) Timing During Normal Operation
- FIGURE 18-8: Auto-Wake-up Bit (WUE) Timings During Sleep
- FIGURE 18-9: Send Break Character Sequence
- FIGURE 18-10: Synchronous Transmission
- FIGURE 18-11: Synchronous Transmission (Through TXEN)
- TABLE 18-7: Registers Associated with Synchronous Master Transmission
- FIGURE 18-12: Synchronous Reception (Master Mode, SREN)
- TABLE 18-8: Registers Associated with Synchronous Master Reception
- TABLE 18-9: Registers Associated with Synchronous Slave Transmission
- TABLE 18-10: Registers Associated with Synchronous Slave Reception
19.0 Liquid Crystal Display (LCD) Driver Module
- FIGURE 19-1: LCD Driver Module Block Diagram
- TABLE 19-1: LCD Segment and Data Registers
- Register 19-1: LCDCON: Liquid Crystal Display (LCD) Control Register
- Register 19-2: LCDPS: LCD Phase Register
- Register 19-3: LCDREF: LCD Reference Voltage Control Register
- Register 19-4: LCDCST: LCD Contrast Control Register
- Register 19-5: LCDSEn: LCD Segment Enable Registers
- Register 19-6: LCDDATAn: LCD Data Registers
- FIGURE 19-2: LCD Clock Generation
- TABLE 19-2: LCD Bias Voltages
- FIGURE 19-3: LCD Bias VOltage Generation Block DIagram
- TABLE 19-3: LCD Internal ladder power modes (1/3 Bias)
- FIGURE 19-4: LCD Internal Reference Ladder power mode switching Diagram – Type A
- FIGURE 19-5: LCD Internal Reference Ladder power mode switching Diagram – Type A Waveform (1/2 MUX, 1/2 Bias Drive)
- FIGURE 19-6: LCD Internal Reference Ladder power mode switching Diagram – Type B Waveform (1/2 MUX, 1/2 Bias Drive)
- Register 19-7: LCDRL: LCD Reference Ladder Control Registers
- FIGURE 19-7: Internal reference and Contrast control Block Diagram
- TABLE 19-4: Common Pin Usage
- TABLE 19-5: Frame Frequency Formulas
- TABLE 19-6: Approximate Frame Frequency (in Hz) Using Fosc @ 8 MHz, Timer1 @ 32.768 kHz or LFINTOSC
- TABLE 19-7: LCD Segment Mapping Worksheet
- FIGURE 19-8: Type-A/Type-B Waveforms in Static Drive
- FIGURE 19-9: Type-A Waveforms in 1/2 MUX, 1/2 Bias Drive
- FIGURE 19-10: Type-B Waveforms in 1/2 MUX, 1/2 Bias Drive
- FIGURE 19-11: Type-A Waveforms in 1/2 MUX, 1/3 Bias Drive
- FIGURE 19-12: Type-B Waveforms in 1/2 MUX, 1/3 Bias Drive
- FIGURE 19-13: Type-A Waveforms in 1/3 MUX, 1/2 Bias Drive
- FIGURE 19-14: Type-B Waveforms in 1/3 MUX, 1/2 Bias Drive
- FIGURE 19-15: Type-A Waveforms in 1/3 MUX, 1/3 Bias Drive
- FIGURE 19-16: Type-B Waveforms in 1/3 MUX, 1/3 Bias Drive
- FIGURE 19-17: Type-A Waveforms in 1/4 MUX, 1/3 Bias Drive
- FIGURE 19-18: Type-B Waveforms in 1/4 MUX, 1/3 Bias Drive
- FIGURE 19-19: Waveforms and Interrupt Timing in Quarter-Duty Cycle Drive (Example – Type-B, Non-Static)
- TABLE 19-8: LCD Module Status During Sleep
- FIGURE 19-20: Sleep Entry/Exit when SLPEN = 1
- TABLE 19-9: sUMMARY OF Registers Associated with LCD Operation
20.0 In-Circuit Serial Programming™ (ICSP™)
- FIGURE 20-1: Vpp Limiter Example Circuit
- FIGURE 20-2: ICD RJ-11 Style Connector Interface
- FIGURE 20-3: PICkit™ Style Connector Interface
- FIGURE 20-4: Typical connection for ICSP™ programming
21.0 Instruction Set Summary
- TABLE 21-1: Opcode Field Descriptions
- TABLE 21-2: Abbreviation Descriptions
- FIGURE 21-1: General Format for Instructions
- TABLE 21-3: PIC16LF1904/6/7 Enhanced Instruction Set
- TABLE 21-3: PIC16LF1904/6/7 Enhanced Instruction Set (Continued)
22.0 Electrical Specifications
- FIGURE 22-1: Voltage Frequency Graph, -40°C £ Ta £ +125°C
- FIGURE 22-2: HFINTOSC Frequency Accuracy Over Device Vdd and Temperature
- FIGURE 22-3: POR and POR Rearm with Slow Rising Vdd
- FIGURE 22-4: Load Conditions
- TABLE 22-1: Clock Oscillator Timing Requirements
- TABLE 22-2: Oscillator Parameters
- FIGURE 22-5: CLKOUT and I/O Timing
- TABLE 22-3: CLKOUT and I/O Timing Parameters
- FIGURE 22-6: Reset, Watchdog Timer, Oscillator Start-up Timer and Power-up Timer Timing
- FIGURE 22-7: Brown-Out Reset Timing and Characteristics
- FIGURE 22-8: Minimum Pulse width for LPBOR Detection
- TABLE 22-4: Reset, Watchdog Timer, Oscillator Start-up Timer, Power-up Timer and Brown-Out Reset Parameters
- FIGURE 22-9: Timer0 and Timer1 External Clock Timings
- TABLE 22-5: Timer0 and Timer1 External Clock Requirements
- TABLE 22-6: PIC16LF1904/6/7 A/D Converter (ADC) Characteristics:
- TABLE 22-7: PIC16LF1904/6/7 A/D Conversion Requirements
- FIGURE 22-10: PIC16LF1904/6/7 A/D Conversion Timing (Normal Mode)
- FIGURE 22-11: PIC16LF1904/6/7 A/D Conversion Timing (Sleep Mode)
23.0 DC and AC Characteristics Graphs and Charts
24.0 Development Support
25.0 Packaging Information
Appendix A: Data Sheet Revision History
The Microchip Web Site
Customer Change Notification Service
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PIC16LF1904/6/7

DS41569A-page 76 Preliminary  2011 Microchip Technology Inc.

7.6.5 PIR2 REGISTER

The PIR2 register contains the interrupt flag bits, as

shown in Register 7-5.

Note: Interrupt flag bits are set when an interrupt

condition occurs, regardless of the state of

its corresponding enable bit or the Global

Enable bit, GIE, of the INTCON register.

User software should ensure the

appropriate interrupt flag bits are clear prior

to enabling an interrupt.

U-0 U-0 U-0 U-0 U-0 R/W-0/0 U-0 U-0

— — — — — LCDIF — —

bit 7 bit 0

Legend:

R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’

u = Bit is unchanged x = Bit is unknown -n/n = Value at POR and BOR/Value at all other Resets

‘1’ = Bit is set ‘0’ = Bit is cleared

bit 7-3 Unimplemented: Read as ‘0’

bit 2 LCDIF: LCD Module Interrupt Flag bit

1 = Interrupt is pending

0 = Interrupt is not pending

bit 1-0 Unimplemented: Read as ‘0’