PIC16F87 datasheet(60/214 Pages) MICROCHIP

60 / 214 page

PIC16F87/88

DS30487B-page 58

Preliminary

 2003 Microchip Technology Inc.

TABLE 5-3:

PORTB FUNCTIONS

TABLE 5-4:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTB

Name

Bit#

Buffer

Function

RB0/INT/CCP1

bit 0

TTL/ST(1) Input/output pin or external interrupt input.

Capture input/Compare output/PWM output pin.

Internal software programmable weak pull-up.

RB1/SDI/SDA

bit 1

TTL/ST(5) Input/output pin, SPI data input pin or I2C data I/O pin.

Internal software programmable weak pull-up.

RB2/SDO/RX/DT

bit 2

TTL/ST(4) Input/output pin, SPI data output pin.

USART asynchronous receive or synchronous data.

Internal software programmable weak pull-up.

RB3/PGM/CCP1(3)

bit 3

TTL/ST(2) Input/output pin, programming in LVP mode or Capture input/Compare

output/PWM output pin. Internal software programmable weak pull-up.

RB4/SCK/SCL

bit 4

TTL/ST(5) Input/output pin or SPI and I2C clock pin (with interrupt-on-change).

Internal software programmable weak pull-up.

RB5/SS/TX/CK

bit 5

TTL

Input/output pin or SPI slave select pin (with interrupt-on-change).

USART asynchronous transmit or synchronous clock.

Internal software programmable weak pull-up.

RB6/AN5/PGC/T1OSO/

T1CKI

bit 6

TTL/ST(2) Input/output pin, analog input(6), serial programming clock

(with interrupt-on-change), Timer1 oscillator output pin or Timer1 clock

input pin. Internal software programmable weak pull-up.

RB7/AN6/PGD/T1OSI

bit 7

TTL/ST(2) Input/output pin, analog input(6), serial programming data (with

interrupt-on-change) or Timer1 oscillator input pin.

Internal software programmable weak pull-up.

Legend: TTL = TTL input, ST = Schmitt Trigger input

Note 1:

This buffer is a Schmitt Trigger input when configured as the external interrupt.

This buffer is a Schmitt Trigger input when used in Serial Programming mode.

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 18-pin

mid-range devices.

This buffer is a Schmitt Trigger input when configured for CCP or SSP mode.

This buffer is a Schmitt Trigger input when configured for SPI or I2C mode.

PIC16F88 only.

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

81h, 181h

OPTION

RBPU

INTEDG

T0CS

T0SE

PSA

PS2

PS1

PS0

1111 1111

9Bh

ANSEL(1)

—

ANS6

ANS5

ANS4

ANS3

ANS2

ANS1

ANS0

-111 1111

Legend: x = unknown, u = unchanged. Shaded cells are not used by PORTB.

Note 1:

PIC16F88 device only.

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