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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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AT89C51ED2-RDTIM 数据表(PDF) 44 Page - ATMEL Corporation |
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AT89C51ED2-RDTIM 数据表(HTML) 44 Page - ATMEL Corporation |
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44 / 137 page  44 AT89C51RD2/ED2 4235E–8051–04/04 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 (Refer to Figure 18). Figure 18. PCA Capture Mode 16-bit Software Timer/ Compare 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 (See Figure 19). CF CR CCO N 0xD8 CH CL CCAPnH CCAPnL CCF4 CCF3 CCF2 CCF1 CCF0 PCA IT PCA Counter/Timer ECOMn CCAPMn, n= 0 to 4 0xDA to 0xDE CAPNn MATn TOGn PWMn ECCFn CAPPn Cex.n Capture |
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