PIC16C641-04SLASHP datasheet(33/136 Pages) MICROCHIP

33 / 136 page

Preliminary

DS30559A-page 33

PIC16C64X & PIC16C66X

EXAMPLE 5-2:

INITIALIZING PORTB

CLRF

PORTB

; Initialize PORTB by

; clearing output

; data latches

BSF

STATUS, RP0

; Select Bank 1

MOVLW

0xCF

; Value used to

; initialize data

; direction

MOVWF

TRISB

; Set RB<3:0> as inputs

; RB<5:4> as outputs

; RB<7:6> as inputs

TABLE 5-3:

PORTB FUNCTIONS

TABLE 5-4:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTB

Name

Bit #

Buffer Type

Function

RB0/INT

bit0

TTL/ST(1)

Input/output 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

bit3

TTL

Input/output pin. 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

bit6

TTL/ST(2)

Input/output pin (with interrupt on change). Internal software programmable

weak pull-up. Serial programming clock pin.

RB7

bit7

TTL/ST(2)

Input/output pin (with interrupt on change). Internal software programmable

weak pull-up. Serial programming data pin.

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

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.

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

PORTB

RB7

RB6

RB5

RB4

RB3

RB2

RB1

RB0

xxxx xxxx

uuuu uuuu

86h

TRISB

TRISB7

TRISB6

TRISB5 TRISB4 TRISB3 TRISB2 TRISB1 TRISB0 1111 1111

1111 1111

81h

OPTION

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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