PIC17C44 datasheet(13/241 Pages) MICROCHIP

13 / 241 page

DS30412C-page 13

PIC17C4X

PORTD is a bi-directional I/O Port.

RD0/AD8

I/O

TTL

This is also the upper byte of the 16-bit system bus in

microprocessor mode or extended microprocessor mode

or extended microcontroller mode. In multiplexed system

bus conﬁguration these pins are address output as well

as data input or output.

RD1/AD9

I/O

TTL

RD2/AD10

I/O

TTL

RD3/AD11

I/O

TTL

RD4/AD12

I/O

TTL

RD5/AD13

I/O

TTL

RD6/AD14

I/O

TTL

RD7/AD15

I/O

TTL

PORTE is a bi-directional I/O Port.

RE0/ALE

I/O

TTL

In microprocessor mode or extended microcontroller

mode, it is the Address Latch Enable (ALE) output.

Address should be latched on the falling edge of ALE

output.

RE1/OE

I/O

TTL

In microprocessor or extended microcontroller mode, it is

the Output Enable (OE) control output (active low).

RE2/WR

I/O

TTL

In microprocessor or extended microcontroller mode, it is

the Write Enable (WR) control output (active low).

TEST

Test mode selection control input. Always tie to VSS for nor-

mal operation.

VSS

10,

11,

12,

33, 34

5, 6,

27, 28

Ground reference for logic and I/O pins.

VDD

1, 44

16, 17

Positive supply for logic and I/O pins.

TABLE 3-1:

PINOUT DESCRIPTIONS

Name

DIP

No.

PLCC

No.

QFP

No.

I/O/P

Type

Buffer

Type

Description

Legend: I = Input only; O = Output only; I/O = Input/Output; P = Power; — = Not Used; TTL = TTL input;

ST = Schmitt Trigger input.

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