AT89LP51RB2 datasheet(99/254 Pages) ATMEL

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3722A–MICRO–10/11

AT89LP51RB2/RC2/IC2 Preliminary

• The TOG bit (CCAPMn.2) when set causes the CEX output associated with the module to

toggle when there is a match between the PCA counter and the modules capture/compare

•The match bit MAT (CCAPMn.3) when set will cause the CCFn bit in the CCON register to be

set when there is a match between the PCA counter and the modules capture/compare

• The next two bits CAPN (CCAPMn.4) and CAPP (CCAPMn.5) determine the edge that a

capture input will be active on. The CAPN bit enables the negative edge, and the CAPP bit

enables the positive edge. If both bits are set both edges will be enabled and a capture will

occur for either transition.

•The last bit in the register ECOM (CCAPMn.6) when set enables the comparator function.

Table 15-6 shows the CCAPMn settings for the various PCA functions.

Table 15-6.

CCAPMn – PCA Module n Compare/Capture Control Register (n = 0–4)

CCAPM0 Address = 0DAH

Reset Value = x000 0000B

CCAPM1 Address = 0DBH

CCAPM2 Address = 0DCH

CCAPM3 Address = 0DDH

CCAPM4 Address = 0DEH

Not Bit Addressable

–

ECOMn

CAPPn

CAPNn

MATn

TOGn

PWMn

ECCFn

Bit

654

321

Symbol

Function

ECOMn

Enable Comparator

Clear to disable the comparator function of Module n. Set to enable the comparator function of Module n

CAPPn

Capture Positive

Clear to disable positive edge capture for Module n. Set to enable positive edge capture for Module n.

CAPNn

Capture Negative

Clear to disable negative edge capture for Module n. Set to enable negative edge capture for Module n.

MATn

Match Enable

When MATn = 1 and ECOMn = 1 a match between the PCA counter and Module n’s compare/capture register will set the

CCFn bit in CCON. Clear MATn to disable setting of CCFn by compare events.

TOGn

Toggle Output

When TOGn = 1 and ECOMn = 1 a match between the PCA counter and Module n’s compare/capture register will toggle

the CEXn pin. Clear TOGn to disable toggling of CEXn by compare events.

PWMn

Pulse Width Modulation Enable

Set to configure Module n in PWM mode and use CEXn as a PWM output. Clear to disable PWM mode for Module n.

ECCFn

Enable CCFn Interrupt

Clear to disable the CCFn bit in CCON as an interrupt source. Set to enable the CCFn bit in CCON to generate interrupts.

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