Intel 8XC251SP, 8XC251SA, 8XC251SQ, 8XC251SB CCAPM1 Sdbh, CCAPM2 Sdch, CCAPM3 Sddh, CCAPM4 Sdeh

REGISTERS

CCAPMx (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 (CCFx in the CCON register) is set. See Table 9-3 on page 9-14 for mode select bit combinations.

7

— ECOM x CAPPx CAPNx

0

MATx TOGx PWMx ECCFx

Bit	Bit	Function
Number	Mnemonic
7	—	Reserved:
		The value read from this bit is indeterminate. Write a zero to this bit.
6	ECOMx	Compare Modes:
		ECOMx = 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	CAPPx	Capture Mode (Positive):
		CAPPx = 1 enables the capture function with capture triggered by a
		positive edge on pin CEXx.
4	CAPNx	Capture Mode (Negative):
		CAPNx = 1 enables the capture function with capture triggered by a
		negative edge on pin CEXx.
3	MATx	Match:
		Set ECOMx and MATx to implement the software timer mode. When
		MATx = 1, a match of the PCA timer/counter with the compare/capture
		register sets the CCFx bit in the CCON register, flagging an interrupt.
2	TOGx	Toggle:
		Set ECOMx, MATx, and TOGx to implement the high-speed output
		mode. When TOGx = 1, a match of the PCA timer/counter with the
		compare/capture register toggles the CEXx pin.
1	PWMx	Pulse Width Modulation Mode:
		PWMx = 1 configures the module for operation as an 8-bit pulse width
		modulator with output waveform on the CEXx pin.
0	ECCFx	Enable CCFx Interrupt:
		Enables compare/capture flag CCFx in the CCON register to generate
		an interrupt request.

C-9