Rainbow-electronics T89C51CC02 Manual de usuario descargar pdf (Pagina 106)

106 Rev.A - May 17, 2001

Preliminary

T89C51CC02

16.4. 16-bit Software Timer Mode

The PCA modules can be used as software timers by setting both the ECOM and MAT bits in the modules

CCAPMn register. The PCA timer will be compared to the module’s capture registers and when a match occurs

an interrupt will occur if the CCFn (CCON SFR) and the ECCFn (CCAPMn SFR) bits for the module are both set.

Figure 107. PCA 16-bit Software Timer and High Speed Output Mode

CCAPnL

CCAPnH

- ECOMn00MATnTOGn0ECCFn

CCAPMn Register

(n = 0, 1)

CH CL

16-Bit

Comparator

Match

Enable

CCFn

CCON reg

PCA

Interrupt

Request

CEXn

Compare/Capture Module

PCA Counter

“0”

“1”

Reset

Write to

CCAPnL

Write to CCAPnH

For software Timer mode, set ECOMn and MATn.

For high speed output mode, set ECOMn, MATn and

TOGn.

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Rainbow-electronics T89C51CC02 Manual de usuario Pagina 106