T89C5115-RATIM datasheet(73/113 Pages) ATMEL

73 / 113 page

AT89C5115

4128F–8051–05/06

PCA Modules

Each one of the two compare/capture modules has six possible functions. It can

perform:

•

16-bit Capture, positive-edge triggered

•

16-bit Capture, negative-edge triggered

•

16-bit Capture, both positive and negative-edge triggered

•

16-bit Software Timer

•

16-bit High Speed Output

•

8-bit Pulse Width Modulator.

Each module in the PCA has a special function register associated with it (CCAPM0 for

module 0 ...). The CCAPM0:1 registers contain the bits that control the mode that each

module will operate in.

•

The ECCF bit enables the CCF flag in the CCON register to generate an interrupt

when a match or compare occurs in the associated module.

•

The PWM bit enables the pulse width modulation mode.

•

The TOG bit 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 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 two bits CAPN and CAPP in CCAPMn register 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.

•

The bit ECOM in CCAPM register when set enables the comparator function.

T89C5115-RATIM Datasheet(PDF) 73 Page - ATMEL Corporation