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AT89C5115-RATUM 数据表(PDF) 75 Page - ATMEL Corporation |
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AT89C5115-RATUM 数据表(HTML) 75 Page - ATMEL Corporation |
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75 / 113 page  75 AT89C5115 4128G–8051–02/08 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 35. PCA 16-bit Software Timer and High Speed Output Mode CCAPnL (8 bits) CCAPnH (8 bits) - ECOMn0 0 MATn TOGn0 ECCFn 7 0 CCAPMn Register (n = 0, 1) CL (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 Write to CCAPnH For software Timer mode, set ECOMn and MATn. For high speed output mode, set ECOMn, MATn and TOGn. Toggle CH (8 bits) |
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