PIC16F570 datasheet(28/134 Pages) MICROCHIP

tên linh kiện	PIC16F570

Giải thích chi tiết về linh kiện	20-Pin, 8-Bit Flash Microcontroller

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PIC16F527

DS40001652C-page 28

 2012-2014 Microchip Technology Inc.

6.5

I/O Interfacing

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

Figure 6-1. All port pins, except the MCLR pin which is

input-only, may be used for both input and output oper-

ations. For input operations, these ports are non-latch-

ing. 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 correspond-

ing 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 MCLR) can be programmed

individually as input or output.

FIGURE 6-1:

BLOCK DIAGRAM OF I/O

PIN (Example shown of

RA2 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.

2: Pin enabled as analog for ADC or comparator.

Pin Change

RxPU

ADC pin Ebl

COMP pin Ebl

ADC

COMP

I/O Pin(1)

(2)

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