Intel 8XC251SA, User Manual

Page: 169 / 458

9-15
PROGRAMMABLE COUNTER ARRAY
Figure 9-9. CCAPM x: PCA Compare/Capture Module Mode 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
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.
5 CAPP x Capture Mode (Positive):
CAPP x = 1 enables the capture function with capture triggered by a
positive edge on pin CEX x .
4 CAPN x Capture Mode (Negative):
CAPN x = 1 enables the capture function with capture triggered by a
negative edge on pin CEX x .
3 MAT 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.
2 TOG 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.
1 PWM 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.