Datasheet

 1999 Microchip Technology Inc. DS40139E-page 11
PIC12C5XX
TABLE 3-1: PIC12C5XX PINOUT DESCRIPTION
Name
DIP
Pin #
SOIC
Pin #
I/O/P
Type
Buffer
Type
Description
GP0 7 7 I/O TTL/ST Bi-directional I/O port/ serial programming data. Can
be software programmed for internal weak pull-up and
wake-up from SLEEP on pin change. This buffer is a
Schmitt Trigger input when used in serial programming
mode.
GP1 6 6 I/O TTL/ST Bi-directional I/O port/ serial programming clock. Can
be software programmed for internal weak pull-up and
wake-up from SLEEP on pin change. This buffer is a
Schmitt Trigger input when used in serial programming
mode.
GP2/T0CKI 5 5 I/O ST Bi-directional I/O port. Can be configured as T0CKI.
GP3/MCLR
/VPP 4 4 I TTL/ST Input port/master clear (reset) input/programming volt-
age input. When configured as MCLR
, this pin is an
active low reset to the device. Voltage on MCLR
/VPP
must not exceed V
DD during normal device operation
or the device will enter programming mode. Can be
software programmed for internal weak pull-up and
wake-up from SLEEP on pin change. Weak pull-up
always on if configured as MCLR
. ST when in MCLR
mode.
GP4/OSC2 3 3 I/O TTL Bi-directional I/O port/oscillator crystal output. Con-
nections to crystal or resonator in crystal oscillator
mode (XT and LP modes only, GPIO in other modes).
GP5/OSC1/CLKIN 2 2 I/O TTL/ST Bidirectional IO port/oscillator crystal input/external
clock source input (GPIO in Internal RC mode only,
OSC1 in all other oscillator modes). TTL input when
GPIO, ST input in external RC oscillator mode.
V
DD 11P— Positive supply for logic and I/O pins
V
SS 8 8 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