16F628 datasheet(45/168 Pages) MICROCHIP

45 / 168 page

 2002 Microchip Technology Inc.

Preliminary

DS40044A-page 43

PIC16F627A/628A/648A

TABLE 5-3:

PORTB FUNCTIONS

TABLE 5-4:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTB(1)

Name

Function Input Type

Output

Type

Description

RB0/INT

RB0

TTL

CMOS

Bi-directional I/O port. Can be software programmed for

internal weak pull-up.

INT

—

External interrupt.

RB1/RX/DT

RB1

TTL

CMOS

Bi-directional I/O port. Can be software programmed for

internal weak pull-up.

—

USART Receive Pin

CMOS

Synchronous data I/O

RB2/TX/CK

RB2

TTL

CMOS

Bi-directional I/O port

—

CMOS

USART Transmit Pin

CMOS

Synchronous Clock I/O. Can be software programmed

for internal weak pull-up.

RB3/CCP1

RB3

TTL

CMOS

Bi-directional I/O port. Can be software programmed for

internal weak pull-up.

CCP1

CMOS

Capture/Compare/PWM/I/O

RB4/PGM

RB4

TTL

CMOS

Bi-directional I/O port. Interrupt-on-pin change. Can be

software programmed for internal weak pull-up.

PGM

—

Low voltage programming input pin. When low voltage

programming is enabled, the interrupt-on-pin change

and weak pull-up resistor are disabled.

RB5

TTL

CMOS

Bi-directional I/O port. Interrupt-on-pin change. Can be

software programmed for internal weak pull-up.

RB6/T1OSO/T1CKI/

PGC

RB6

TTL

CMOS

Bi-directional I/O port. Interrupt-on-pin change. Can be

software programmed for internal weak pull-up.

T1OSO

—

XTAL

Timer1 Oscillator Output

T1CKI

—

Timer1 Clock Input

PGC

—

ICSP Programming Clock

RB7/T1OSI/PGD

RB7

TTL

CMOS

Bi-directional I/O port. Interrupt-on-pin change. Can be

software programmed for internal weak pull-up.

T1OSI

XTAL

—

Timer1 Oscillator Input

PGD

CMOS

ICSP Data I/O

Legend:

O = Output

CMOS = CMOS Output

= Power

— = Not used

= Input

ST = Schmitt Trigger Input

TTL = TTL Input

= Open Drain Output

AN = Analog

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

POR

Value on

All Other

RESETS

06h, 106h

PORTB

RB7

RB6

RB5

RB4(2)

RB3

RB2

RB1

RB0

xxxx xxxx

uuuu uuuu

86h, 186h

TRISB

TRISB7

TRISB6

TRISB5

TRISB4

TRISB3

TRISB2

TRISB1

TRISB0

1111 1111

81h, 181h

OPTION

RBPU

INTEDG

T0CS

T0SE

PSA

PS2

PS1

PS0

1111 1111

Legend: u = unchanged, x = unknown

Note

1: Shaded bits are not used by PORTB.

2: LVP Configuration Bit sets RB4 functionality.

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