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PIC16F870/P Datasheet(PDF) 30 Page - Microchip Technology

Part # PIC16F870/P
Description  28/40-Pin 8-Bit CMOS FLASH Microcontrollers
PDF  156 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F870/P Datasheet(HTML) 30 Page - Microchip Technology

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PIC16F870/871
DS30569A-page 30
Preliminary
© 1999 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.
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
bit3
TTL/ST(1)
Input/output pin or programming pin in LVP mode. Internal software
programmable weak pull-up.
RB4
bit4
TTL
Input/output pin (with interrupt on change). Internal software programmable
weak pull-up.
RB5
bit5
TTL
Input/output pin (with interrupt on change). Internal software programmable
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.
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.
Legend: TTL = TTL input, ST = Schmitt Trigger input
Note 1: This buffer is a Schmitt Trigger input when configured as the external interrupt or LVP mode.
2: This buffer is a Schmitt Trigger input when used in serial programming mode.
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.



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