T89C51RC2-3CSIM datasheet(36/117 Pages) ATMEL

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T89C51RB2/RC2

4105D–8051–10/06

High Speed Output Mode In this mode the CEX output (on port 1) associated with the PCA module will toggle

each time a match occurs between the PCA counter and the module's capture registers.

To activate this mode the TOG, MAT, and ECOM bits in the module's CCAPMn SFR

must be set (See Figure 14).

A prior write must be done to CCAPnL and CCAPnH before writing the ECOMn bit.

Figure 14. PCA High Speed Output Mode

Before enabling ECOM bit, CCAPnL and CCAPnH should be set with a non zero value,

otherwise an unwanted match could happen.

Once ECOM set, writing CCAPnL will clear ECOM so that an unwanted match doesn’t

occur while modifying the compare value. Writing to CCAPnH will set ECOM. For this

reason, user software should write CCAPnL first, and then CCAPnH. Of course, the

ECOM bit can still be controlled by accessing to CCAPMn register.

CCAPnH

CCAPnL

ECOMn

CCAPMn, n = 0 to 4

0xDA to 0xDE

CAPNn MATn TOGn PWMn ECCFn

CAPPn

16 bit comparator

Match

CCON

0xD8

CCF4 CCF3

CCF2

CCF1

CCF0

PCA IT

Enable

CEXn

PCA counter/timer

Write to

CCAPnH

Reset

Write to

CCAPnL

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