T89C51RD2-3CWC-M datasheet(26/86 Pages) ATMEL

26 / 86 page

Rev. F - 15 February, 2001

T89C51RD2

Table 9. CCAPMn: PCA Modules Compare/Capture Control Registers

Table 10. PCA Module Modes (CCAPMn Registers)

There are two additional registers associated with each of the PCA modules. They are CCAPnH and CCAPnL and

these are the registers that store the 16-bit count when a capture occurs or a compare should occur. When a module

is used in the PWM mode these registers are used to control the duty cycle of the output (See Table 11 & Table 12)

CCAPMn Address

n=0-4

CCAPM0=0DAH

CCAPM1=0DBH

CCAPM2=0DCH

CCAPM3=0DDH

CCAPM4=0DEH

ECOMn

CAPPn

CAPNn

MATn

TOGn

PWMm

ECCFn

Reset value

Symbol

Function

Not implemented, reserved for future use.a

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

No Operation

0000

16-bit capture by a positive-edge

trigger on CEXn

1000

16-bit capture by a negative trigger on

CEXn

16-bit capture by a transition on CEXn

100100

16-bit Software Timer / Compare

mode.

16-bit High Speed Output

8-bit PWM

Watchdog Timer (module 4 only)

T89C51RD2-3CWC-M Datasheet(PDF) 26 Page - ATMEL Corporation

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