PIC16LC716T-20E/P 데이터 시트보기 (PDF) - Microchip Technology

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PIC16LC716T-20E/P

8-Bit CMOS Microcontrollers with A/D Converter and Capture/Compare/PWM

Microchip Technology 

PIC16C712/716

FIGURE 3-2: BLOCK DIAGRAM OF RA4/T0CKI PIN

DATA

BUS

WR

PORT

WR

TRIS

DQ

CK Q

Data Latch

DQ

CK Q

TRIS Latch

N

I/O Pin

VSS VSS

Schmitt

Trigger

Input

Buffer

RD TRIS

QD

RD PORT

ENEN

TMR0 Clock Input

TABLE 3-1 PORTA FUNCTIONS

Name

Bit# Buffer Function

RA0/AN0

RA1/AN1

bit0

TTL Input/output or analog input

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

Input/output or external clock input for Timer0

RA4/T0CKI

bit4

ST

Output is open drain type

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

TABLE 3-2 SUMMARY OF REGISTERS ASSOCIATED WITH PORTA

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

— — —(1) RA4 RA3 RA2 RA1 RA0 --xx xxxx --xu uuuu

85h

TRISA

— — —(1) PORTA Data Direction Register

--11 1111 --11 1111

9Fh

ADCON1 — — — — — PCFG2 PCFG1 PCFG0 ---- -000 ---- -000

Legend: x = unknown, u = unchanged, - = unimplemented locations read as '0'. Shaded cells are not used by

PORTA.

Note 1: Reserved bits; Do Not Use.

DS41106A-page 22

Preliminary

© 1998 Microchip Technology Inc.

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