PIC17C42 Microchip Technology, PIC17C42 Datasheet - Page 13

• Manufacturer Part Number: PIC17C42
• Description: High-Performance 8-Bit CMOS EPROM/ROM Microcontroller
• Manufacturer: Microchip Technology

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