RFPIC12F675H Microchip Technology Inc., RFPIC12F675H Datasheet - Page 21
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RFPIC12F675H
Manufacturer Part Number
RFPIC12F675H
Description
20-pin Flash-based 8-bit Cmos Microcontroller With Uhf Ask/fsk Transmitter
Manufacturer
Microchip Technology Inc.
Datasheet
1.RFPIC12F675H.pdf
(136 pages)
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3.2.2
Each of the GPIO pins is individually configurable as an
interrupt-on-change pin. Control bits IOC enable or
disable the interrupt function for each pin. Refer to
Register 3-4. The interrupt-on-change is disabled on a
Power-on Reset.
For enabled interrupt-on-change pins, the values are
compared with the old value latched on the last read of
GPIO. The ‘mismatch’ outputs of the last read are OR'd
together to set, the GP Port Change Interrupt flag bit
(GPIF) in the INTCON register.
REGISTER 3-4:
2003 Microchip Technology Inc.
bit 7-6
bit 5-0
INTERRUPT-ON-CHANGE
IOC — INTERRUPT-ON-CHANGE GPIO REGISTER (ADDRESS: 96h)
bit 7
Unimplemented: Read as ‘0’
IOC<5:0>: Interrupt-on-Change GPIO Control bit
1 = Interrupt-on-change enabled
0 = Interrupt-on-change disabled
Note 1: Global interrupt enable (GIE) must be enabled for individual interrupts to be
Legend:
R = Readable bit
- n = Value at POR
U-0
—
recognized.
U-0
—
R/W-0
IOC5
Preliminary
W = Writable bit
’1’ = Bit is set
R/W-0
IOC4
This interrupt can wake the device from SLEEP. The
user, in the Interrupt Service Routine, can clear the
interrupt in the following manner:
a)
b)
A mismatch condition will continue to set flag bit GPIF.
Reading GPIO will end the mismatch condition and
allow flag bit GPIF to be cleared.
Note:
Any read or write of GPIO. This will end the
mismatch condition.
Clear the flag bit GPIF.
R/W-0
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared
IOC3
If a change on the I/O pin should occur
when the read operation is being executed
(start of the Q2 cycle), then the GPIF inter-
rupt flag may not get set.
R/W-0
IOC2
rfPIC12F675
x = Bit is unknown
R/W-0
IOC1
DS70091A-page 19
R/W-0
IOC0
bit 0
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