PIC16F84A datasheet(54/337 Pages) MICROCHIP

54 / 337 page

PIC16C6X

DS30234D-page 54

FIGURE 5-4:

BLOCK DIAGRAM OF THE

RB7:RB4 PINS FOR

PIC16C62A/63/R63/64A/65A/

R65/66/67

Data Latch

From other

RBPU(2)

VDD

I/O

Data bus

WR Port

WR TRIS

Set RBIF

TRIS Latch

RD TRIS

RD Port

RB7:RB4 pins

weak

pull-up

RD Port

Latch

TTL

Input

Buffer

pin(1)

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

Buffer

RB7:RB6 in serial programming mode

2: To enable weak pull-ups, set the appropriate TRIS bit(s)

and clear the RPBU bit (OPTION<7>).

FIGURE 5-5:

BLOCK DIAGRAM OF THE

RB3:RB0 PINS

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

Schmitt Trigger

Buffer

TRIS Latch

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

2: To enable weak pull-ups, set the appropriate TRIS bit(s)

and clear the RPBU bit (OPTION<7>).

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 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 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, 106h PORTB

RB7

RB6

RB5

RB4

RB3

RB2

RB1

RB0

xxxx xxxx

uuuu uuuuu

86h, 186h TRISB

PORTB Data Direction Register

1111 1111

81h, 181h 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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