PIC18F4580-I/P Microchip Technology Inc., PIC18F4580-I/P Datasheet - Page 254
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PIC18F4580-I/P
Manufacturer Part Number
PIC18F4580-I/P
Description
40 PIN, 32 KB FLASH, 1536 RAM, 36 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F4580-IP.pdf
(402 pages)
Specifications of PIC18F4580-I/P
A/d Inputs
11-Channel, 10-Bit
Comparators
2
Cpu Speed
10 MIPS
Eeprom Memory
256 Bytes
Input Output
36
Interface
CAN/I2C/SPI/USART
Memory Type
Flash
Number Of Bits
8
Package Type
40-pin PDIP
Programmable Memory
32K Bytes
Ram Size
1.5K Bytes
Speed
40 MHz
Timers
1-8 bit, 3-16 bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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FIGURE 21-3:
21.6
The comparator interrupt flag is set whenever there is
a change in the output value of either comparator.
Software will need to maintain information about the
status of the output bits, as read from CMCON<7:6>, to
determine the actual change that occurred. The CMIF
bit (PIR2 register) is the Comparator Interrupt Flag. The
CMIF bit must be reset by clearing ‘0’. Since it is also
possible to write a ‘1’ to this register, a simulated
interrupt may be initiated.
The CMIE bit (PIE2 register) and the PEIE bit (INTCON
register) must be set to enable the interrupt. In addition,
the GIE bit must also be set. If any of these bits are
clear, the interrupt is not enabled, though the CMIF bit
will still be set if an interrupt condition occurs.
DS41159D-page 252
PIC18FXX8
Comparator Interrupts
COMPARATOR OUTPUT BLOCK DIAGRAM
Set
CMIF
bit
To RE1 or
RE2 pin
Bus
Data
Read CMCON
From
Other
Comparator
Q
Q
EN
D
CL
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 CMIF.
Reading CMCON will end the mismatch condition and
allow flag bit CMIF to be cleared.
EN
Note:
D
Any read or write of CMCON will end the
mismatch condition.
Clear flag bit CMIF.
Reset
Read CMCON
If a change in the CMCON register
(C1OUT or C2OUT) should occur when a
read operation is being executed (start of
the Q2 cycle), then the CMIF (PIR2
register) interrupt flag may not get set.
MULTIPLEX
Port Pins
+
-
2004 Microchip Technology Inc.
CxINV
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