Datasheet

PIC16C77X
 1999-2013 Microchip Technology Inc. Advance Information DS30275B-page 7
TABLE 1-1 PIC16C773 PINOUT DESCRIPTION
Pin Name
DIP,
SSOP,
SOIC
Pin#
I/O/P
Type
Buffer
Type
Description
OSC1/CLKIN 9 I
ST/CMOS
(3)
Oscillator crystal input/external clock source input.
OSC2/CLKOUT 10 O — Oscillator crystal output. Connects to crystal or resonator in crystal
oscillator mode. In RC mode, the OSC2 pin outputs CLKOUT which has
1/4 the frequency of OSC1, and denotes the instruction cycle rate.
MCLR
/VPP
1 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.
RA0/AN0 2 I/O TTL RA0 can also be analog input0
RA1/AN1 3 I/O TTL RA1 can also be analog input1
RA2/AN2/V
REF-/VRL 4 I/O TTL RA2 can also be analog input2 or negative analog reference voltage
input or internal voltage reference low
RA3/AN3/V
REF+/VRH 5 I/O TTL RA3 can also be analog input3 or positive analog reference voltage
input or internal voltage reference high
RA4/T0CKI 6 I/O ST RA4 can also be the clock input to the Timer0 module. Output is
open drain type.
PORTB is a bi-directional I/O port. PORTB can be software pro-
grammed for internal weak pull-up on all inputs.
RB0/INT 21 I/O TTL/ST
(1)
RB0 can also be the external interrupt pin.
RB1/SS
22 I/O TTL/ST
(1)
RB1 can also be the SSP slave select
RB2/AN8 23 I/O TTL RB2 can also be analog input8
RB3/AN9/LVDIN 24 I/O TTL RB3 can also be analog input9 or the low voltage detect input
reference
RB4 25 I/O TTL Interrupt on change pin.
RB5 26 I/O TTL Interrupt on change pin.
RB6 27 I/O TTL/ST
(2)
Interrupt on change pin. Serial programming clock.
RB7 28 I/O TTL/ST
(2)
Interrupt on change pin. Serial programming data.
PORTC is a bi-directional I/O port.
RC0/T1OSO/T1CKI 11 I/O ST RC0 can also be the Timer1 oscillator output or Timer1 clock input.
RC1/T1OSI/CCP2 12 I/O ST RC1 can also be the Timer1 oscillator input or Capture2 input/
Compare2 output/PWM2 output.
RC2/CCP1 13 I/O ST RC2 can also be the Capture1 input/Compare1 output/PWM1
output.
RC3/SCK/SCL 14 I/O ST RC3 can also be the synchronous serial clock input/output for both
SPI and I
2
C modes.
RC4/SDI/SDA 15 I/O ST RC4 can also be the SPI Data In (SPI mode) or
data I/O (I
2
C mode).
RC5/SDO 16 I/O ST RC5 can also be the SPI Data Out (SPI mode).
RC6/TX/CK 17 I/O ST RC6 can also be the USART Asynchronous Transmit or
Synchronous Clock.
RC7/RX/DT 18 I/O ST RC7 can also be the USART Asynchronous Receive or
Synchronous Data.
AV
SS 8 P Ground reference for A/D converter
AV
DD 7 P Positive supply for A/D converter
V
SS 19 P — Ground reference for logic and I/O pins.
V
DD 20 P — Positive supply 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
Note 1: This buffer is a Schmitt Trigger input when configured for the multiplexed function.
2: This buffer is a Schmitt Trigger input when used in serial programming mode.
3: This buffer is a Schmitt Trigger input when configured in RC oscillator mode and a CMOS input otherwise.
774.book Page 7 Tuesday, January 29, 2013 12:02 PM