PIC16C83 datasheet(24/117 Pages) MICROCHIP

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PIC16C8X

DS30081F-page 24

FIGURE 5-5:

BLOCK DIAGRAM OF PINS

RB3:RB0 (ALL OTHER

PIC16C8X DEVICES)

Data Latch

RBPU(2)

VDD

Data bus

WR Port

WR TRIS

RD TRIS

RD Port

weak

pull-up

RD Port

RB0/INT

I/O

pin(1)

TTL

Input

Buffer

Note 1: I/O pins have diode protection to VDD and VSS.

2: TRISB = '1' enables weak pull-up if RBPU = '0'

(OPTION<7>).

Schmitt Trigger

Buffer

TRIS Latch

EXAMPLE 5-2:

INITIALIZING PORTB

CLRF

PORTB

; Initialize PORTB by

; setting 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

I/O Consistency 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

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.

RB7

bit7

TTL/ST(2)

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

weak pull-up. Serial programming data.

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

Note 1: This buffer is a Schmitt Trigger input when conﬁgured as the external interrupt, except for the PIC16C84,

which remains TTL.

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

Power-on

Reset

Value on all

other resets

06h

PORTB

RB7

RB6

RB5

RB4

RB3

RB2

RB1

RB0/INT

xxxx xxxx

uuuu uuuu

86h

TRISB

TRISB7

TRISB6

TRISB5

TRISB4

TRISB3

TRISB2

TRISB1

TRISB0

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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