AT89C51RC2-3CSCM 查看數據表（PDF） - Atmel Corporation

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AT89C51RC2-3CSCM

8-bit Microcontroller with 16K/32K Bytes Flash

Atmel Corporation 

AT89C51RB2/RC2

PCA Capture Mode

To use one of the PCA Modules in the 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 Mod-

ule (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 registers (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

(see Figure 13).

Figure 13. PCA Capture Mode

CF CR

CCF4 CCF3 CCF2 CCF1 CCF0 CCON

0xD8

PCA IT

Cex. n

Capture

PCA Counter/Timer

CH

CL

CCAPnH

CCAPnL

ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn CCAPMn, n = 0 to 4

0xDA to 0xDE

39

4180E–8051–10/06

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