PIC16F526-ISLASHP datasheet(29/122 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS41326D-page 29

PIC16F526

6.4

I/O Interfacing

The equivalent circuit for an I/O port pin is shown in

Figure 6-1. All port pins, except RB3 which is input-

only, may be used for both input and output operations.

For input operations, these ports are non-latching. Any

input must be present until read by an input instruction

(e.g., MOVF PORTB, W). The outputs are latched and

remain unchanged until the output latch is rewritten. To

use a port pin as output, the corresponding direction

control bit in TRIS must be cleared (= 0). For use as an

input, the corresponding TRIS bit must be set. Any I/O

pin (except RB3) can be programmed individually as

input or output.

FIGURE 6-1:

BLOCK DIAGRAM OF RB0

AND RB1 (with Weak Pull-

up and Wake-up on

Change)

Data

Bus

Port

TRIS ‘f’

Data

TRIS

RD Port

Reg

Latch

Reset

Note 1:

I/O pins have protection diodes to VDD and

VSS.

Pin Change

RBPU

GPPU

ADC pin Ebl

COMP pin Ebl

ADC

COMP

I/O Pin(1)

PIC16F526-I/P 数据表(PDF) 29 Page - Microchip Technology

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