DM163006 datasheet(104/320 Pages) MICROCHIP

104 / 320 page

PIC18C601/801

DS39541A-page 104

Advance Information

 2001 Microchip Technology Inc.

FIGURE 9-2:

RA4/T0CKI PIN BLOCK

DIAGRAM

TABLE 9-1:

PORTA FUNCTIONS

TABLE 9-2:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTA

Data

Bus

WR TRISA

RD PORTA

Data Latch

TRIS Latch

RD TRISA

Schmitt

Trigger

Input

Buffer

VSS

I/O pin(1)

TMR0 Clock Input

Note 1: I/O pin has diode protection to VSS only.

RD LATA

WR LATA

WR 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/VREF-

bit2

TTL

Input/output or analog input or VREF-

RA3/AN3/VREF+

bit3

TTL

Input/output or analog input or VREF+

RA4/T0CKI

bit4

ST/OD

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

RA5/SS/AN4/LVDIN

bit5

TTL

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

input or low voltage detect input

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

—

RA5

RA4

RA3

RA2

RA1

RA0

--0x 0000

--uu uuuu

LATA

—

Latch A Data Output Register

-xxx xxxx

-uuu uuuu

TRISA

—

PORTA Data Direction Register

-111 1111

ADCON1

—

VCFG1 VCFG0

PCFG3

PCFG2

PCFG1

PCFG0 --00 0000 --uu uuuu

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

Shaded cells are not used by PORTA.

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