PIC18F258-I/SP 查看數據表（PDF） - Microchip Technology

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PIC18F258-I/SP

28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module

Microchip Technology 

PIC18FXX8

FIGURE 9-1:

RA3:RA0 AND RA5 PINS

BLOCK DIAGRAM

FIGURE 9-2:

RA4/T0CKI PIN BLOCK

DIAGRAM

RD LATA

Data Bus

WR LATA or

WR PORTA

D

Q

CK Q

Data Latch

D

Q

WR TRISA

Analog

Input Mode

CK Q

TRIS Latch

VDD

P

N

I/O pin(1)

VSS

RD TRISA

Q

D

TTL

Input

Buffer

EN

RD PORTA

SS Input (RA5 only)

To A/D Converter and LVD Modules

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

RD LATA

Data Bus

WR LATA or

WR PORTA

D

Q

CK Q

Data Latch

D

Q

WR TRISA

CK Q

TRIS Latch

RD TRISA

N

VSS

TTL

Input

Buffer

RD PORTA

TMR0 Clock Input

Q

D

EN

Note 1: I/O pin has diode protection to VSS only.

I/O pin(1)

Schmitt

Trigger

Input

Buffer

FIGURE 9-3:

OSC2/CLKO/RA6 PIN BLOCK DIAGRAM

(FOSC = 101, 111)

CLKO (FOSC/4)

1

Data Latch

Data Bus

D

Q

0

From OSC1

WR PORTA

CK Q

TRIS Latch

D

Q

WR TRISA

(FOSC = 100,

101, 110, 111)

CK Q

Oscillator

Circuit

VDD

P

N

VSS

RD TRISA

RD PORTA

(FOSC = 110, 100)

DQata LatcDh

EN

Schmitt

Trigger

Input Buffer

Note 1: CLKO is 1/4 of FOSC.

2: I/O pin has diode protection to VDD and VSS.

OSC2/CLKO

RA6 pin(2)

DS41159E-page 94

© 2006 Microchip Technology Inc.

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