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PIC16F873-04ISP 数据手册 - Microchip（微芯）
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PIC16F873-04ISP数据手册
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PIC16F87X
DS30292C-page 8 2001 Microchip Technology Inc.
TABLE 1-2: PIC16F874 AND PIC16F877 PINOUT DESCRIPTION
Pin Name
DIP
Pin#
PLCC
Pin#
QFP
Pin#
I/O/P
Type
Buffer
Type
Description
OSC1/CLKIN 13 14 30 I ST/CMOS
(4)
Oscillator crystal input/external clock source input.
OSC2/CLKOUT 14 15 31 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 18 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 3 19 I/O TTL RA0 can also be analog input0.
RA1/AN1 3 4 20 I/O TTL RA1 can also be analog input1.
RA2/AN2/V
REF- 4 5 21 I/O TTL RA2 can also be analog input2 or negative
analog reference voltage.
RA3/AN3/V
REF+ 5 6 22 I/O TTL RA3 can also be analog input3 or positive
analog reference voltage.
RA4/T0CKI 6 7 23 I/O ST RA4 can also be the clock input to the Timer0 timer/
counter. Output is open drain type.
RA5/SS/
AN4 7 8 24 I/O TTL RA5 can also be analog input4 or the slave select for
the synchronous serial port.
PORTB is a bi-directional I/O port. PORTB can be soft-
ware programmed for internal weak pull-up on all inputs.
RB0/INT 33 36 8 I/O TTL/ST
(1)
RB0 can also be the external interrupt pin.
RB1 34 37 9 I/O TTL
RB2 35 38 10 I/O TTL
RB3/PGM 36 39 11 I/O TTL RB3 can also be the low voltage programming input.
RB4 37 41 14 I/O TTL Interrupt-on-change pin.
RB5 38 42 15 I/O TTL Interrupt-on-change pin.
RB6/PGC 39 43 16 I/O TTL/ST
(2)
Interrupt-on-change pin or In-Circuit Debugger pin.
Serial programming clock.
RB7/PGD 40 44 17 I/O TTL/ST
(2)
Interrupt-on-change pin or In-Circuit Debugger pin.
Serial programming data.
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 as an external interrupt.
2: This buffer is a Schmitt Trigger input when used in Serial Programming mode.
3: This buffer is a Schmitt Trigger input when configured as general purpose I/O and a TTL input when used in the Parallel
Slave Port mode (for interfacing to a microprocessor bus).
4: This buffer is a Schmitt Trigger input when configured in RC oscillator mode and a CMOS input otherwise.
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