Datasheet

PIC16C5X
DS30453E-page 12 Preliminary  1997-2013 Microchip Technology Inc.
TABLE 3-2: PINOUT DESCRIPTION - PIC16C55, PIC16C57, PIC16CR57
Pin Name
Pin Number
Pin
Type
Buffer
Type
Description
DIP SOIC SSOP
RA0
RA1
RA2
RA3
6
7
8
9
6
7
8
9
5
6
7
8
I/O
I/O
I/O
I/O
TTL
TTL
TTL
TTL
Bi-directional I/O port
RB0
RB1
RB2
RB3
RB4
RB5
RB6
RB7
10
11
12
13
14
15
16
17
10
11
12
13
14
15
16
17
9
10
11
12
13
15
16
17
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
Bi-directional I/O port
RC0
RC1
RC2
RC3
RC4
RC5
RC6
RC7
18
19
20
21
22
23
24
25
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
TTL
TTL
TTL
TTL
TTL
TTL
TTL
Bi-directional I/O port
T0CKI 1 1 2 I ST Clock input to Timer0. Must be tied to V
SS or VDD, if not in
use, to reduce current consumption.
MCLR
28 28 28 I ST Master clear (RESET) input. This pin is an active low
RESET to the device.
OSC1/CLKIN 27 27 27 I ST Oscillator crystal input/external clock source input.
OSC2/CLKOUT 26 26 26 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.
V
DD 2 2 3,4 P — Positive supply for logic and I/O pins.
VSS 4 4 1,14 P — Ground reference for logic and I/O pins.
N/C 3,5 3,5 — — — Unused, do not connect.
Legend: I = input, O = output, I/O = input/output, P = power, — = Not Used, TTL = TTL input, ST = Schmitt Trigger
input