AT89C51CC03C-RLTIM 查看數據表（PDF） - Atmel Corporation

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AT89C51CC03C-RLTIM

Enhanced 8-bit MCU with CAN Controller and Flash Memory

Atmel Corporation 

Figure 67. PCA Timer/Counter

FPca/6

FPca/2

T0 OVF

P1.2

AT89C51CC03

To PCA

modules

overflow

It

CH

CL

16 bit up counter

Idle

PCA Modules

4182K–CAN–05/06

CIDL WDTE

CPS1 CPS0 ECF

CMOD

0xD9

CF CR

CCF4 CCF3 CCF2 CCF1 CCF0

CCON

0xD8

The CMOD register includes three additional bits associated with the PCA.

• The CIDL bit which allows the PCA to stop during idle mode.

• The WDTE bit which enables or disables the WatchDog function on module 4.

• The ECF bit which when set causes an interrupt and the PCA overflow flag CF in

CCON register to be set when the PCA timer overflows.

The CCON register contains the run control bit for the PCA and the flags for the PCA

timer and each module.

• The CR bit must be set to run the PCA. The PCA is shut off by clearing this bit.

• The CF bit is set when the PCA counter overflows and an interrupt will be generated

if the ECF bit in CMOD register is set. The CF bit can only be cleared by software.

• The CCF0:4 bits are the flags for the modules (CCF0 for module0...) and are set by

hardware when either a match or a capture occurs. These flags also can be cleared

by software.

Each one of the five compare/capture modules has six possible functions. It can

perform:

• 16-bit Capture, positive-edge triggered

• 16-bit Capture, negative-edge triggered

• 16-bit Capture, both positive and negative-edge triggered

• 16-bit Software Timer

• 16-bit High Speed Output

• 8-bit Pulse Width Modulator.

In addition module 4 can be used as a WatchDog Timer.

143

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