PIC876 datasheet(32/218 Pages) MICROCHIP

32 / 218 page

PIC16F87X

DS30292C-page 30

 2001 Microchip Technology Inc.

TABLE 3-1:

PORTA FUNCTIONS

TABLE 3-2:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTA

Name

Bit#

Buffer

Function

RA0/AN0

bit0

TTL

Input/output or analog input.

RA1/AN1

bit1

TTL

Input/output or analog input.

RA2/AN2

bit2

TTL

Input/output or analog input.

RA3/AN3/VREF

bit3

TTL

Input/output or analog input or VREF.

RA4/T0CKI

bit4

Input/output or external clock input for Timer0. Output is open drain type.

RA5/SS/AN4

bit5

TTL

Input/output or slave select input for synchronous serial port or analog input.

Legend: TTL = TTL input, ST = Schmitt Trigger input

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on:

POR,

BOR

Value on all

other

RESETS

05h

PORTA

—

RA5

RA4

RA3

RA2

RA1

RA0

--0x 0000

--0u 0000

85h

TRISA

—

PORTA Data Direction Register

--11 1111

9Fh

ADCON1 ADFM

—

PCFG3 PCFG2 PCFG1 PCFG0 --0- 0000

--0- 0000

Legend: x = unknown, u = unchanged, - = unimplemented locations read as '0'.

Shaded cells are not used by PORTA.

Note:

When using the SSP module in SPI Slave mode and SS enabled, the A/D converter must be set to one of

the following modes, where PCFG3:PCFG0 = 0100,0101, 011x, 1101, 1110, 1111.

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