PIC16LC773 datasheet(30/200 Pages) MICROCHIP

30 / 200 page

PIC16C77X

DS30275A-page 30

Advance Information

The RB3 pin is multiplexed with analog channel 9 and

the low voltage detect input (RB3/AN9/LVDIN)

FIGURE 3-7:

BLOCK DIAGRAM OF

RB3/AN9/LVDIN PIN

Four of PORTB’s pins, RB7:RB4, have an interrupt on

change feature. Only pins configured as inputs can

cause this interrupt to occur (i.e. any RB7:RB4 pin con-

figured as an output is excluded from the interrupt on

change comparison). The input pins (of RB7:RB4) are

compared with the old value latched on the last read of

PORTB. The “mismatch” outputs of RB7:RB4 are

OR’ed together to generate the RB Port Change Inter-

rupt with flag bit RBIF (INTCON<0>).

This interrupt can wake the device from SLEEP. The

user, in the interrupt service routine, can clear the inter-

rupt in the following manner:

Any read or write of PORTB. This will end the

mismatch condition.

Clear flag bit RBIF.

A mismatch condition will continue to set flag bit RBIF.

Reading PORTB will end the mismatch condition, and

allow flag bit RBIF to be cleared.

The interrupt on change feature is recommended for

wake-up on key depression operation and operations

where PORTB is only used for the interrupt on change

feature. Polling of PORTB is not recommended while

using the interrupt on change feature.

FIGURE 3-8:

BLOCK DIAGRAM OF

RB7:RB4 PINS

Data Latch

RBPU(2)

VDD

Data bus

WR Port

WR TRIS

RD TRIS

RD Port

weak

pull-up

RD Port

To A/D converter and LVD reference input

I/O

pin(1)

TTL

Input

Buffer

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 RBPU bit (OPTION_REG<7>).

TRIS Latch

Analog

input mode

or LVD input

mode

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_REG<7>).

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