PIC16F628AESS 查看數據表（PDF） - Microchip Technology

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PIC16F628AESS

Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC16F627A/628A/648A

FIGURE 5-12:

RBPU

BLOCK DIAGRAM OF RB4/PGM PIN

VDD

P weak pull-up

Data Bus

WR PORTB

WR TRISB

RD TRISB

LVP (Configuration Bit)

RD PORTB

PGM input

D

Q

CK Q

Data Latch

D

Q

CK Q

TRIS Latch

Schmitt

Trigger

Set RBIF

From other

RB<7:4> pins

VDD

RB4/PGM

VSS

TTL

input

buffer

Q

D

EN

Q1

Q

D

Q3

EN

Note: The low-voltage programming disables the interrupt-on-change and the weak pull-ups on RB4.

© 2007 Microchip Technology Inc.

DS40044F-page 39

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