T89C51AC2-RLSI-M datasheet(85/117 Pages) ATMEL

85 / 117 page

Draft.A - March 30, 2001

Preview - Confidential

T89C51AC2

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

Figure 74. CCAPMn Registers

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.

ECOMn

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

CAPNn

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.

MATn

Match Module x bit

Set when a match of the PCA Counter with the Compare/Capture register sets CCFx bit in CCON

Must be cleared by software.

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.

Must be cleared by software.

PWMn

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.

T89C51AC2-RLSI-M 数据表(PDF) 85 Page - ATMEL Corporation

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