Rainbow-electronics T89C51AC2 Manual de usuario descargar pdf (Pagina 72)

T89C51AC2

Rev. B – 19-Dec-01

Figure 32. PCA Capture Mode

15.5 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

CEXn

n=0,4

PCA Counter

(8bits)

CCAPnH

CCAPnL

CCFn

CCON

PCA

Interrupt

Request

- 0CAPPnCAPNn000ECCFn

CCAPMn Register (n = 0, 4)

CCAPnL

(8 bits)

CCAPnH

- ECOMn0 0MATn TOGn0 ECCFn

CCAPMn Register

(n = 0, 4)

(8 bits)

16-Bit Com-

parator

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.

Toggle

1 2 ... 67 68 69 70 71 72 73 74 75 76 77 ... 109 110

T89C51AC2 1

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Rainbow-electronics T89C51AC2 Manual de usuario Pagina 72

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