AT80C51RA2-RLSIV datasheet(28/85 Pages) IRF

28 / 85 page

4188E–8051–08/06

AT/TS8xC51Rx2

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

Table 6-7 shows the CCAPMn settings for the various PCA functions.

Table 6-6.

CCAPMn: PCA Modules Compare/Capture Control Registers

Table 6-7.

PCA Module Modes (CCAPMn Registers)

CCAPMn Address

n = 0 - 4

CCAPM0=0DAH

CCAPM1=0DBH

CCAPM2=0DCH

CCAPM3=0DDH

CCAPM4=0DEH

ECOMn

CAPPn

CAPNn

MATn

TOGn

PWMm

ECCFn

Reset value

00000

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 register

causes the 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 register

causes the CEXn pin to toggle.

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

16-bit capture by a positive-edge trigger

on CEXn

16-bit capture by a negative trigger on

CEXn

16-bit capture by a transition on CEXn

16-bit Software Timer / Compare mode.

16-bit High Speed Output

8-bit PWM

Watchdog Timer (module 4 only)

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