
2002 Microchip Technology Inc.
Preliminary
DS30453D-page 11
PIC16C5X
TABLE 3-1:
PINOUT DESCRIPTION - PIC16C54, PIC16CR54, PIC16C56, PIC16CR56, PIC16C58,
PIC16CR58
Pin Name
Pin Number
Pin
Buffer
Description
DIP
SOIC
SSOP Type
Type
RA0
RA1
RA2
RA3
17
18
1
2
17
18
1
2
19
20
1
2
I/O
TTL
Bi-directional I/O port
RB0
RB1
RB2
RB3
RB4
RB5
RB6
RB7
6
7
8
9
10
11
12
13
6
7
8
9
10
11
12
13
7
8
9
10
11
12
13
14
I/O
TTL
Bi-directional I/O port
T0CKI
3
I
ST
Clock input to Timer0. Must be tied to VSS or VDD, if not in
use, to reduce current consumption.
MCLR/VPP
4
I
ST
Master clear (RESET) input/programming voltage input.
This pin is an active low RESET to the device. Voltage on
the MCLR/VPP pin must not exceed VDD to avoid unin-
tended entering of Programming mode.
OSC1/CLKIN
16
18
I
ST
Oscillator crystal input/external clock source input.
OSC2/CLKOUT
15
17
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
14
15,16
P
—
Positive supply for logic and I/O pins.
VSS
5
5,6
P
—
Ground reference for logic and I/O pins.
Legend: I = input, O = output, I/O = input/output, P = power, — = Not Used, TTL = TTL input, ST = Schmitt Trigger
input