Rainbow-electronics T89C5115 Manual de usuario descargar pdf (Pagina 69)

T89C5115

4128A–8051–04/02

PCA Interrupt

Figure 31. PCA Interrupt System

PCA Capture Mode To use one of the PCA modules in capture mode either one or both of the CCAPM bits

CAPN and CAPP for that module must be set. The external CEX input for the module

(on port 1) is sampled for a transition. When a valid transition occurs the PCA hardware

loads the value of the PCA counter registers (CH and CL) into the module’s capture reg-

isters (CCAPnL and CCAPnH). If the CCFn bit for the module in the CCON SFR and the

ECCFn bit in the CCAPMn SFR are set then an interrupt will be generated.

Figure 32. PCA Capture Mode

CF CR

CCON

0xD8

CCF1 CCF0

Module 1

Module 0

PCA Timer/Counter

To Interrupt

IEN0.6

IEN0.7

ECF

CMOD.0

ECCFn

CCAPMn.0

CEXn

n=0,1

PCA Counter

(8bits)

CCAPnH

CCAPnL

CCFn

CCON Reg

PCA

Interrupt

Request

CCAPMn Register (n = 0, 1)

ECCFnCAPNn0000CAPPn

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 104 105

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Rainbow-electronics T89C5115 Manual de usuario Pagina 69