PIC18F258-ESLASHSP datasheet(97/402 Pages) MICROCHIP

97 / 402 page

DS41159E-page 95

PIC18FXX8

TABLE 9-1:

PORTA FUNCTIONS

TABLE 9-2:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTA

Name

Bit#

Buffer

Function

RA0/AN0/CVREF

bit 0

TTL

Input/output, analog input or analog comparator voltage reference

output.

RA1/AN1

bit 1

TTL

Input/output or analog input.

RA2/AN2/VREF-

bit 2

TTL

Input/output, analog input or VREF-.

RA3/AN3/VREF+

bit 3

TTL

Input/output, analog input or VREF+.

RA4/T0CKI

bit 4

ST/OD

Input/output, external clock input for Timer0, output is open-drain type.

RA5/AN4/SS/LVDIN

bit 5

TTL

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

or Low-Voltage Detect input.

OSC2/CLKO/RA6

bit 6

TTL

Oscillator clock output or input/output.

Legend: TTL = TTL input, ST = Schmitt Trigger input, OD = Open-Drain

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

-00x 0000

-uuu uuuu

LATA

—

Latch A Data Output Register

-xxx xxxx

-uuu uuuu

TRISA

—

PORTA Data Direction Register

-111 1111

ADCON1

ADFM ADCS2

—

PCFG3

PCFG2

PCFG1

PCFG0 00-- 0000 uu-- uuuu

Legend:

= unknown, u = unchanged, - = unimplemented locations read as ‘0’. Shaded cells are not used by PORTA.

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