18F8680 datasheet(129/496 Pages) MICROCHIP

129 / 496 page

 2004 Microchip Technology Inc.

DS30491C-page 127

PIC18F6585/8585/6680/8680

TABLE 10-1:

PORTA FUNCTIONS

TABLE 10-2:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTA

Name

Bit#

Buffer

Function

RA0/AN0

bit 0

TTL

Input/output or analog input.

RA1/AN1

bit 1

TTL

Input/output or analog input.

RA2/AN2/VREF-

bit 2

TTL

Input/output or analog input or VREF-.

RA3/AN3/VREF+

bit 3

TTL

Input/output or analog input or VREF+.

RA4/T0CKI

bit 4

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

RA5/AN4/LVDIN

bit 5

TTL

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

input, or Low-Voltage Detect input.

OSC2/CLKO/RA6

bit 6

TTL

OSC2 or clock output, or I/O pin.

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

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

PORTA

—

RA6

RA5

RA4

RA3

RA2

RA1

RA0

-x0x 0000 -u0u 0000

LATA

—

LATA Data Output Register

-xxx xxxx -uuu uuuu

TRISA

—

PORTA Data Direction Register

-111 1111 -111 1111

ADCON1

—

VCFG1 VCFG0

PCFG3

PCFG2

PCFG1

PCFG0

--00 0000 --00 0000

Legend: x = unknown, u = unchanged, – = unimplemented locations read as ‘0’.

Shaded cells are not used by PORTA.

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