PIC16C72-04SLASHSS datasheet(46/288 Pages) MICROCHIP

46 / 288 page

PIC16C7X

DS30390E-page 46

FIGURE 5-4:

BLOCK DIAGRAM OF

RB7:RB4 PINS (PIC16C73/74)

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 RBPU bit (OPTION<7>).

FIGURE 5-5:

BLOCK DIAGRAM OF

RB7:RB4 PINS (PIC16C72/

73A/74A/76/77)

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 RBPU bit (OPTION<7>).

TABLE 5-3:

PORTB FUNCTIONS

Name

Bit#

Buffer

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.

PIC16C72-04/SS Datasheet(PDF) 46 Page - Microchip Technology

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