PIC16F818-ESLASHML datasheet(46/176 Pages) MICROCHIP

46 / 176 page

PIC16F818/819

DS39598E-page 44

 2004 Microchip Technology Inc.

TABLE 5-3:

PORTB FUNCTIONS

TABLE 5-4:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTB

Name

Bit#

Buffer

Function

RB0/INT

bit 0

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

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/CCP1

bit 2

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

Capture input/Compare output/PWM output pin.

Internal software programmable weak pull-up.

RB3/CCP1/PGM(3)

bit 3

TTL/ST(2) Input/output pin, Capture input/Compare output/PWM output pin

or programming in LVP mode. 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

bit 5

TTL

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

Internal software programmable weak pull-up.

RB6/T1OSO/T1CKI/

PGC

bit 6

TTL/ST(2) Input/output pin, Timer1 oscillator output pin, Timer1 clock input pin or

serial programming clock (with interrupt-on-change).

Internal software programmable weak pull-up.

RB7/T1OSI/PGD

bit 7

TTL/ST(2) Input/output pin, Timer1 oscillator input pin or serial programming data

(with interrupt-on-change).

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.

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_REG RBPU

INTEDG

T0CS

T0SE

PSA

PS2

PS1

PS0

1111 1111

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

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