user manual

C-9
REGISTERS
CCAPM x ( x = 0–4)
Address: CCAPM0 S:DAH
CCAPM1 S:DBH
CCAPM2 S:DCH
CCAPM3 S:DDH
CCAPM4 S:DEH
Reset State: X000 0000B
PCA Compare/Capture Module Mode Registers. These five registers select the operating mode of the
corresponding compare/capture module. Each register also contains an enable interrupt bit (ECCFx)
for generating an interrupt request when the module’s compare/capture flag (CCF
x in the CCON
register) is set. See Table 9-3 on page 9-14 for mode select bit combinations.
7 0
— ECOM
x CAPP x CAPN x MAT x TOG x PWM x ECCF x
Bit
Number
Bit
Mnemonic
Function
7 — Reserved:
The value read from this bit is indeterminate. Write a zero to this bit.
6 ECOM
x Compare Modes:
ECOM
x = 1 enables the module comparator function. The comparator is
used to implement the software timer, high-speed output, pulse width
modulation, and watchdog timer modes.
5CAPP
x Capture Mode (Positive):
CAPP
x = 1 enables the capture function with capture triggered by a
positive edge on pin CEX
x .
4CAPN
x Capture Mode (Negative):
CAPN
x = 1 enables the capture function with capture triggered by a
negative edge on pin CEX
x .
3MAT
x Match:
Set ECOM
x and MAT x to implement the software timer mode. When
MAT
x = 1, a match of the PCA timer/counter with the compare/capture
register sets the CCF
x bit in the CCON register, flagging an interrupt.
2TOG
x Toggle:
Set ECOM
x, MAT x , and TOG x to implement the high-speed output
mode. When TOG
x = 1, a match of the PCA timer/counter with the
compare/capture register toggles the CEX
x pin.
1PWM
x Pulse Width Modulation Mode:
PWM
x = 1 configures the module for operation as an 8-bit pulse width
modulator with output waveform on the CEX
x pin.
0 ECCF
x Enable CCF x Interrupt:
Enables compare/capture flag CCF
x in the CCON register to generate
an interrupt request.