T89C51RD2-RDTIL datasheet(27/104 Pages) ATMEL

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T89C51RD2

4243G–8051–05/03

•

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

function.

Table 13 shows the CCAPMn settings for the various PCA functions.

Table 12. CCAPMn: PCA Modules Compare/Capture Control Registers

Table 13. PCA Module Modes (CCAPMn Registers)

CCAPMn

Address

n = 0 - 4

CCAPM0=0DAH

CCAPM1=0DBH

CCAPM2=0DCH

CCAPM3=0DDH

CCAPM4=0DEH

ECO

CAPP

CAPN

MATn

TOGn

PWM

ECCF

Reset value

Symbol

Function

Not implemented, reserved for future use. (1)

User software should not write 1s to reserved bits. These bits may be used in future 8051

family products to invoke new features. In that case, the reset or inactive value of the

new bit will be 0, and its active value will be 1. The value read from a reserved bit is

indeterminate.

ECOMn

Enable Comparator. ECOMn = 1 enables the comparator function.

CAPPn

Capture Positive, CAPPn = 1 enables positive edge capture.

CAPNn

Capture Negative, CAPNn = 1 enables negative edge capture.

MATn

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

TOGn

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

PWMn

Pulse Width Modulation Mode. PWMn = 1 enables the CEXn pin to be used as a pulse

width modulated output.

ECCFn

Enable CCF interrupt. Enables compare/capture flag CCFn in the CCON register to

generate an interrupt.

ECOMn

CAPPn

CAPNn

MATn

TOGn

PWMm

ECCFn

Module Function

000

No Operation

000

16-bit capture by a positive-edge

trigger on CEXn

100

16-bit capture by a negative trigger

on CEXn

100

16-bit capture by a transition on

CEXn

010

16-bit Software Timer / Compare

mode.

16-bit High Speed Output

000

8-bit PWM

T89C51RD2-RDTIL Datasheet(PDF) 27 Page - ATMEL Corporation

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