Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller PLCC 68 (24.23x24.23) 8-Bit 4 MHz I/O number 25

 1997 Microchip Technology Inc. DS30444E - page 19

PIC16C9XX

4.2.2 SPECIAL FUNCTION REGISTERS

The Special Function Registers are registers used by

the CPU and Peripheral Modules for controlling the

desired operation of the device. These registers are

implemented as static RAM.

The special function registers can be classiﬁed into two

sets (core and peripheral). Those registers associated

with the “core” functions are described in this section,

and those related to the operation of the peripheral fea-

tures are described in the section of that peripheral fea-

ture.

TABLE 4-1: SPECIAL FUNCTION REGISTER SUMMARY

Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Value on

Power-on

Reset

Value on all

other resets

Bank 0

00h INDF Addressing this location uses contents of FSR to address data memory (not a physical register) 0000 0000 0000 0000

01h TMR0 Timer0 module’s register xxxx xxxx uuuu uuuu

02h PCL Program Counter's (PC) Least Signiﬁcant Byte 0000 0000 0000 0000

03h STATUS IRP RP1 RP0 T

O PD Z DC C 0001 1xxx 000q quuu

04h FSR Indirect data memory address pointer xxxx xxxx uuuu uuuu

05h PORTA

— — PORTA Data Latch when written: PORTA pins when read

(4) (4)

06h PORTB PORTB Data Latch when written: PORTB pins when read xxxx xxxx uuuu uuuu

07h PORTC

— — PORTC Data Latch when written: PORTC pins when read --xx xxxx --uu uuuu

08h PORTD PORTD Data Latch when written: PORTD pins when read 0000 0000 0000 0000

09h PORTE PORTE pins when read 0000 0000 0000 0000

0Ah PCLATH

— — — Write Buffer for the upper 5 bits of the Program Counter ---0 0000 ---0 0000

0Bh INTCON GIE PEIE T0IE INTE RBIE T0IF INTF RBIF 0000 000x 0000 000u

0Ch PIR1 LCDIF ADIF

(2)

— — SSPIF CCP1IF TMR2IF TMR1IF 00-- 0000 00-- 0000

0Dh — Unimplemented — —

0Eh TMR1L Holding register for the Least Signiﬁcant Byte of the 16-bit TMR1 register xxxx xxxx uuuu uuuu

0Fh TMR1H Holding register for the Most Signiﬁcant Byte of the 16-bit TMR1 register xxxx xxxx uuuu uuuu

10h T1CON

— — T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS TMR1ON --00 0000 --uu uuuu

11h TMR2 Timer2 module’s register 0000 0000 0000 0000

12h T2CON

— TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0 TMR2ON T2CKPS1 T2CKPS0 -000 0000 -000 0000

13h SSPBUF Synchronous Serial Port Receive Buffer/Transmit Register xxxx xxxx uuuu uuuu

14h SSPCON WCOL SSPOV SSPEN CKP SSPM3 SSPM2 SSPM1 SSPM0 0000 0000 0000 0000

15h CCPR1L Capture/Compare/PWM Register (LSB) xxxx xxxx uuuu uuuu

16h CCPR1H Capture/Compare/PWM Register (MSB) xxxx xxxx uuuu uuuu

17h CCP1CON

— — CCP1X CCP1Y CCP1M3 CCP1M2 CCP1M1 CCP1M0 --00 0000 --00 0000

18h — Unimplemented — —

19h — Unimplemented — —

1Ah — Unimplemented — —

1Bh — Unimplemented — —

1Ch — Unimplemented — —

1Dh — Unimplemented — —

1Eh

(1)

ADRES A/D Result Register xxxx xxxx uuuu uuuu

1Fh

(1)

ADCON0 ADCS1 ADCS0 CHS2 CHS1 CHS0 GO/DONE

(5)

ADON 0000 0000 0000 0000

Legend: x = unknown, u = unchanged, q = value depends on condition, - = unimplemented read as '0',

shaded locations are unimplemented, read as ‘0’.

Note 1: Registers ADRES, ADCON0, and ADCON1 are not implemented in the PIC16C923, read as '0'.

2: These bits are reserved on the PIC16C923, always maintain these bits clear.

3: These pixels do not display, but can be used as general purpose RAM.

4: PIC16C923 reset values for PORTA: --xx xxxx for a POR, and --uu uuuu for all other resets,

PIC16C924 reset values for PORTA: --0x 0000 when read.

5: Bit1 of ADCON0 is reserved on the PIC16C924, always maintain this bit clear.