AT89C51AC3-RDTUM datasheet(103/143 Pages) ATMEL

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103

AT89C51AC3

4383B–8051–01/05

Table 54. CCAPMn Registers

CCAPM0 (S:DAh)

CCAPM1 (S:DBh)

CCAPM2 (S:DCh)

CCAPM3 (S:DDh)

CCAPM4 (S:DEh)

PCA Compare/Capture Module n Mode registers (n=0..4)

Reset Value = X000 0000b

543

210

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.

6ECOMn

Enable Compare Mode Module x bit

Clear to disable the Compare function.

Set to enable the Compare function.

The Compare function is used to implement the software Timer, the high-speed

output, the Pulse Width Modulator (PWM) and the WatchDog Timer (WDT).

CAPPn

Capture Mode (Positive) Module x bit

Clear to disable the Capture function triggered by a positive edge on CEXx pin.

Set to enable the Capture function triggered by a positive edge on CEXx pin

4CAPNn

Capture Mode (Negative) Module x bit

Clear to disable the Capture function triggered by a negative edge on CEXx pin.

Set to enable the Capture function triggered by a negative edge on CEXx pin.

3MATn

Match Module x bit

Set when a match of the PCA Counter with the Compare/Capture register sets

CCFx bit in CCON register, flagging an interrupt.

TOGn

Toggle Module x bit

The toggle mode is configured by setting ECOMx, MATx and TOGx bits.

Set when a match of the PCA Counter with the Compare/Capture register

toggles the CEXx pin.

1PWMn

Pulse Width Modulation Module x Mode bit

Set to configure the module x as an 8-bit Pulse Width Modulator with output

waveform on CEXx pin.

ECCFn

Enable CCFx Interrupt bit

Clear to disable CCFx bit in CCON register to generate an interrupt request.

Set to enable CCFx bit in CCON register to generate an interrupt request.

AT89C51AC3-RDTUM Datasheet(PDF) 103 Page - ATMEL Corporation

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