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PIC16F873A-I/SP
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PIC16F873A-I/SP数据手册
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2003 Microchip Technology Inc. DS39582B-page 9
PIC16F87XA
PORTB is a bidirectional I/O port. PORTB can be software
programmed for internal weak pull-ups on all inputs.
RB0/INT
RB0
INT
21 18
I/O
I
TTL/ST
(1)
Digital I/O.
External interrupt.
RB1
22 19 I/O TTL
Digital I/O.
RB2
23 20 I/O TTL
Digital I/O.
RB3/PGM
RB3
PGM
24 21
I/O
I
TTL
Digital I/O.
Low-voltage (single-supply) ICSP programming enable pin.
RB4
25 22 I/O TTL
Digital I/O.
RB5
26 23 I/O TTL
Digital I/O.
RB6/PGC
RB6
PGC
27 24
I/O
I
TTL/ST
(2)
Digital I/O.
In-circuit debugger and ICSP programming clock.
RB7/PGD
RB7
PGD
28 25
I/O
I/O
TTL/ST
(2)
Digital I/O.
In-circuit debugger and ICSP programming data.
PORTC is a bidirectional I/O port.
RC0/T1OSO/T1CKI
RC0
T1OSO
T1CKI
11 8
I/O
O
I
ST
Digital I/O.
Timer1 oscillator output.
Timer1 external clock input.
RC1/T1OSI/CCP2
RC1
T1OSI
CCP2
12 9
I/O
I
I/O
ST
Digital I/O.
Timer1 oscillator input.
Capture2 input, Compare2 output, PWM2 output.
RC2/CCP1
RC2
CCP1
13 10
I/O
I/O
ST
Digital I/O.
Capture1 input, Compare1 output, PWM1 output.
RC3/SCK/SCL
RC3
SCK
SCL
14 11
I/O
I/O
I/O
ST
Digital I/O.
Synchronous serial clock input/output for SPI mode.
Synchronous serial clock input/output for I
2
C mode.
RC4/SDI/SDA
RC4
SDI
SDA
15 12
I/O
I
I/O
ST
Digital I/O.
SPI data in.
I
2
C data I/O.
RC5/SDO
RC5
SDO
16 13
I/O
O
ST
Digital I/O.
SPI data out.
RC6/TX/CK
RC6
TX
CK
17 14
I/O
O
I/O
ST
Digital I/O.
USART asynchronous transmit.
USART1 synchronous clock.
RC7/RX/DT
RC7
RX
DT
18 15
I/O
I
I/O
ST
Digital I/O.
USART asynchronous receive.
USART synchronous data.
V
SS 8, 19 5, 6 P Ground reference for logic and I/O pins.
V
DD 20 17 P Positive supply for logic and I/O pins.
TABLE 1-2: PIC16F873A/876A PINOUT DESCRIPTION (CONTINUED)
Pin Name
PDIP, SOIC,
SSOP Pin#
QFN
Pin#
I/O/P
Type
Buffer
Type
Description
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 the 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 in RC Oscillator mode and a CMOS input otherwise.

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