Rainbow-electronics T89C5115 Manual de usuario descargar pdf (Pagina 70)

T89C5115

4128A–8051–04/02

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

CCAPnL

(8 bits)

CCAPnH

(8 bits)

- ECOMn0 0 MATn TOGn0 ECCFn

CCAPMn Register

(n = 0, 1)

(8 bits)

16-Bit Comparator

Match

Enable

CCFn

CCON reg

PCA

Interrupt

Request

CEXn

Compare/Capture Module

PCA Counter

“0”

“1”

Reset

Write to

CCAPnL

WritetoCCAPnH

For software Timer mode, set ECOMn and MATn.

For high speed output mode, set ECOMn, MATn and TOGn.

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Rainbow-electronics T89C5115 Manual de usuario Pagina 70