Microchip Technology IC MCU FLASH PIC16F874-20I/P DIP-40 MCP PIC16F874-20I/P 데이터 시트
제품 코드
PIC16F874-20I/P
PIC16F87X
DS30292D-page 32
1998-2013 Microchip Technology Inc.
TABLE 3-3:
PORTB FUNCTIONS
TABLE 3-4:
SUMMARY OF REGISTERS ASSOCIATED WITH PORTB
Name
Bit#
Buffer Function
RB0/INT
bit0
TTL/ST
(1)
Input/output pin or external interrupt input. Internal software
programmable weak pull-up.
programmable weak pull-up.
RB1
bit1
TTL
Input/output pin. Internal software programmable weak pull-up.
RB2
bit2
TTL
Input/output pin. Internal software programmable weak pull-up.
RB3/PGM
(3)
bit3
TTL
Input/output pin or programming pin in LVP mode. Internal software
programmable weak pull-up.
programmable weak pull-up.
RB4
bit4
TTL
Input/output pin (with interrupt-on-change). Internal software programmable
weak pull-up.
weak pull-up.
RB5
bit5
TTL
Input/output pin (with interrupt-on-change). Internal software programmable
weak pull-up.
weak pull-up.
RB6/PGC
bit6
TTL/ST
(2)
Input/output pin (with interrupt-on-change) or In-Circuit Debugger pin.
Internal software programmable weak pull-up. Serial programming clock.
Internal software programmable weak pull-up. Serial programming clock.
RB7/PGD
bit7
TTL/ST
(2)
Input/output pin (with interrupt-on-change) or In-Circuit Debugger pin.
Internal software programmable weak pull-up. Serial programming data.
Internal software programmable weak pull-up. Serial programming data.
Legend: TTL = TTL input, ST = Schmitt Trigger input
Note 1: This buffer is a Schmitt Trigger input when configured as the external interrupt.
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: Low Voltage ICSP Programming (LVP) is enabled by default, which disables the RB3 I/O function. LVP
3: Low Voltage ICSP Programming (LVP) is enabled by default, which disables the RB3 I/O function. LVP
must be disabled to enable RB3 as an I/O pin and allow maximum compatibility to the other 28-pin and
40-pin mid-range devices.
40-pin mid-range devices.
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on:
POR,
BOR
Value on
all other
RESETS
06h, 106h
PORTB
RB7
RB6
RB5
RB4
RB3
RB2
RB1
RB0
xxxx xxxx
uuuu uuuu
86h, 186h
TRISB
PORTB Data Direction Register
1111 1111
1111 1111
81h, 181h
OPTION_REG
RBPU
INTEDG
T0CS
T0SE
PSA
PS2
PS1
PS0
1111 1111
1111 1111
Legend: x = unknown, u = unchanged. Shaded cells are not used by PORTB.