AT89C5131A-RDTUM datasheet(62/188 Pages) ATMEL

62 / 188 page

4337K–USB–04/08

AT89C5130A/31A-M

• The ECCF bit (CCAPMn.0 where n = 0, 1, 2, 3, or 4 depending on the module) enables the

CCF flag in the CCON SFR to generate an interrupt when a match or compare occurs in the

associated module.

• PWM (CCAPMn.1) enables the pulse width modulation mode.

• 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 module's 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 module's 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 14-4 shows the CCAPMn settings for the various PCA functions.

Table 14-3.

CCAPMn Registers (n = 0-4)

CCAPM0 - PCA Module 0 Compare/Capture Control Register (0DAh)

CCAPM1 - PCA Module 1 Compare/Capture Control Register (0DBh)

CCAPM2 - PCA Module 2 Compare/Capture Control Register (0DCh)

CCAPM3 - PCA Module 3 Compare/Capture Control Register (0DDh)

CCAPM4 - PCA Module 4 Compare/Capture Control Register (0DEh)

ECOMn

CAPPn

CAPNn

MATn

TOGn

PWMn

ECCFn

Bit

Number

Bit

Mnemonic

Description

Reserved

The value read from this bit is indeterminate. Do not set this bit.

ECOMn

Enable Comparator

Cleared to disable the comparator function.

Set to enable the comparator function.

CAPPn

Capture Positive

Cleared to disable positive edge capture.

Set to enable positive edge capture.

CAPNn

Capture Negative

Cleared to disable negative edge capture.

Set to enable negative edge capture.

MATn

Match

When MATn = 1, a match of the PCA counter with this module's compare/capture

CCFn bit in CCON to be set, flagging an interrupt.

TOGn

Toggle

When TOGn = 1, a match of the PCA counter with this module's compare/capture

AT89C5131A-RDTUM Datasheet(PDF) 62 Page - ATMEL Corporation

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