Datasheet

PIC16C9XX
DS30444E - page 12  1997 Microchip Technology Inc.
TABLE 3-1: PIC16C9XX PINOUT DESCRIPTION
Pin Name
DIP
Pin#
PLCC
Pin#
TQFP
Pin#
Pin
Type
Buffer
Type
Description
OSC1/CLKIN 22 24 14 I ST/CMOS Oscillator crystal input or external clock source input. This
buffer is a Schmitt Trigger input when configured in RC
oscillator mode and a CMOS input otherwise.
OSC2/CLKOUT 23 25 15 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.
MCLR/VPP 1 2 57 I/P ST Master clear (reset) input or programming voltage input.
This pin is an active low reset to the device.
PORTA is a bi-directional I/O port. The AN and VREF multi-
plexed functions are used by the PIC16C924 only.
RA0/AN0 4 5 60 I/O TTL RA0 can also be Analog input0.
RA1/AN1 5 6 61 I/O TTL RA1 can also be Analog input1.
RA2/AN2 7 8 63 I/O TTL RA2 can also be Analog input2.
RA3/AN3/VREF 8 9 64 I/O TTL RA3 can also be Analog input3 or A/D Voltage Refer-
ence.
RA4/T0CKI 9 10 1 I/O ST RA4 can also be the clock input to the Timer0
timer/counter. Output is open drain type.
RA5/AN4/SS 10 11 2 I/O TTL RA5 can be the slave select for the synchronous serial
port or Analog input4.
PORTB is a bi-directional I/O port. PORTB can be software
programmed for internal weak pull-ups on all inputs.
RB0/INT 12 13 4 I/O TTL/ST RB0 can also be the external interrupt pin. This buffer
is a Schmitt Trigger input when configured as an exter-
nal interrupt.
RB1 11 12 3 I/O TTL
RB2 3 4 59 I/O TTL
RB3 2 3 58 I/O TTL
RB4 64 68 56 I/O TTL Interrupt on change pin.
RB5 63 67 55 I/O TTL Interrupt on change pin.
RB6 61 65 53 I/O TTL/ST Interrupt on change pin. Serial programming clock.
This buffer is a Schmitt Trigger input when used in
serial programming mode.
RB7 62 66 54 I/O TTL/ST Interrupt on change pin. Serial programming data.
This buffer is a Schmitt Trigger input when used in
serial programming mode.
PORTC is a bi-directional I/O port.
RC0/T1OSO/T1CKI 24 26 16 I/O ST RC0 can also be the Timer1 oscillator output or
Timer1 clock input.
RC1/T1OSI 25 27 17 I/O ST RC1 can also be the Timer1 oscillator input.
RC2/CCP1 26 28 18 I/O ST RC2 can also be the Capture1 input/Compare1 out-
put/PWM1 output.
RC3/SCK/SCL 13 14 5 I/O ST RC3 can also be the synchronous serial clock
input/output for both SPI and I
2
C modes.
RC4/SDI/SDA 14 15 6 I/O ST RC4 can also be the SPI Data In (SPI mode) or data
I/O (I
2
C mode).
RC5/SDO 15 16 7 I/O ST RC5 can also be the SPI Data Out (SPI mode).
C1 16 17 8 P LCD Voltage Generation.
C2 17 18 9 P LCD Voltage Generation.
Legend: I = input O = output P = power L = LCD Driver
— = Not used TTL = TTL input ST = Schmitt Trigger input