PIC16C5X
TABLE 3-2:
PINOUT DESCRIPTION - PIC16C55s, PIC16C57s, PIC16CR57s
DIP, SOIC SSOP I/O/P Input
Name
Description
No.
No. Type Levels
RA0
RA1
RA2
RA3
6
7
8
9
5
6
7
8
I/O
I/O
I/O
I/O
TTL Bi-directional I/O port
TTL
TTL
TTL
RB0
RB1
RB2
RB3
RB4
RB5
RB6
RB7
10
11
12
13
14
15
16
17
9
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
TTL Bi-directional I/O port
10
11
12
13
15
16
17
TTL
TTL
TTL
TTL
TTL
TTL
TTL
RC0
RC1
RC2
RC3
RC4
RC5
RC6
RC7
18
19
20
21
22
23
24
25
18
19
20
21
22
23
24
25
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
TTL Bi-directional I/O port
TTL
TTL
TTL
TTL
TTL
TTL
TTL
T0CKI
1
2
I
ST
Clock input to Timer0. Must be tied to VSS or VDD if not in use
to reduce current consumption.
MCLR
28
28
I
ST
Master clear (reset) input.This pin is an active low reset to the
device.
OSC1/CLKIN
27
26
27
26
I
ST
—
Oscillator crystal input/external clock source input.
OSC2/CLKOUT
O
Oscillator crystal output. Connects to crystal or resonator in
crystal oscillator mode. In RC mode, OSC2 pin outputs
CLKOUT which has 1/4 the frequency of OSC1, and denotes
the instruction cycle rate.
VDD
VSS
N/C
2
4
3,4
1,14
—
P
P
—
—
—
Positive supply for logic and I/O pins.
Ground reference for logic and I/O pins.
Unused, do not connect
3,5
—
Legend: I = input, O = output, I/O = input/output,
P = power, — = Not Used,
TTL = TTL input, ST = Schmitt Trigger input
DS30453B-page 12
Preliminary
1998 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
