T89C51CC02CA-RATIM datasheet(104/145 Pages) ATMEL

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T89C51CC02

4126D–CAN–05/03

Figure 42. PCA Timer/Counter

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

•

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

•

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 CCF0:1 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.

CIDL

CPS1

CPS0

ECF

16-bit up/down counter

To PCA

modules

FPca/6

FPca/2

T0 OVF

P1.2

Idle

CMOD

0xD9

CCON

0xD8

CCF1

CCF0

overflow

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