PIC17C44 Datasheet, PDF (13/241 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM/ROM Microcontroller

PIC17C4X
TABLE 3-1: PINOUT DESCRIPTIONS
Name
DIP
No.
PLCC
No.
QFP
No.
I/O/P
Type
Buffer
Type
Description
RD0/AD8
RD1/AD9
RD2/AD10
RD3/AD11
RD4/AD12
RD5/AD13
RD6/AD14
RD7/AD15
RE0/ALE
RE1/OE
PORTD is a bi-directional I/O Port.
40 43 15 I/O TTL
39 42 14 I/O TTL
38 41 13 I/O TTL
37 40 12 I/O TTL
36 39 11 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.
35 38 10 I/O TTL
34 37
9 I/O TTL
33 36
8 I/O TTL
PORTE is a bi-directional I/O Port.
30 32
4 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.
29 31
3 I/O TTL
In microprocessor or extended microcontroller mode, it is
the Output Enable (OE) control output (active low).
RE2/WR
28 30
2 I/O TTL
In microprocessor or extended microcontroller mode, it is
the Write Enable (WR) control output (active low).
TEST
27 29
1
I ST Test mode selection control input. Always tie to VSS for nor-
mal operation.
VSS
10, 11, 5, 6, P
Ground reference for logic and I/O pins.
31 12, 27, 28
33, 34
VDD
1 1, 44 16, 17 P
Positive supply for logic and I/O pins.
Legend: I = Input only; O = Output only; I/O = Input/Output; P = Power; — = Not Used; TTL = TTL input;
ST = Schmitt Trigger input.
© 1996 Microchip Technology Inc.
DS30412C-page 13