PIC16LC773-20/SP View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
PIC16LC773-20/SP Datasheet PDF : 202 Pages
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PIC16C77X
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
RBPU(2)
VDD
P
weak
pull-up
Data bus
Data Latch
DQ
WR Port
CK
I/O
pin(1)
TRIS Latch
DQ
WR TRIS
CK
RD TRIS
Analog
input mode
or LVD input
mode
TTL
Input
Buffer
QD
RD Port
EN
To A/D converter and LVD reference input
RD Port
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>).
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:
a) Any read or write of PORTB. This will end the
mismatch condition.
b) 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:
RBPU(2)
Data bus
WR Port
BLOCK DIAGRAM OF
RB7:RB4 PINS
VDD
Data Latch
DQ
CK
P
weak
pull-up
I/O
pin(1)
TRIS Latch
DQ
WR TRIS
CK
TTL
Input
Buffer
ST
Buffer
RD TRIS
Latch
QD
Set RBIF
RD Port
EN
Q1
From other
RB7:RB4 pins
QD
EN
RB7:RB6 in serial programming mode
RD Port
Q3
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>).
DS30275B-page 30
Advance Information
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