PIC18F1220 View Datasheet(PDF) - Microchip Technology

Part Name

Description

MFG CO.

PIC18F1220

18/20/28-Pin High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

Microchip Technology 

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PIC18F1220/1320

FIGURE 10-12:

BLOCK DIAGRAM OF RB5/PGM/KBI1 PIN

RBPU(2)

Data Bus

WR LATB

or PORTB

WR TRISB

RD TRISB

Data Latch

DQ

CK

TRIS Latch

DQ

CK

VDD

P

Weak

Pull-up

I/O pin(1)

TTL

Input

Buffer

ST

Buffer

RD LATB

RD PORTB

Set RBIF

Latch

QD

EN

Q1

From other

RB7:RB5 and

RB4 pins

RB7:RB5 in Serial Programming Mode

QD

EN

RD PORTB

Q3

Note 1: I/O pins have diode protection to VDD and VSS.

2: To enable weak pull-ups, set the appropriate TRIS bit(s) and clear the RBPU bit

(INTCON2<7>).

© 2007 Microchip Technology Inc.

DS39605F-page 95

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