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AT89C51CC03U-RDTIM 数据表(PDF) 144 Page - ATMEL Corporation |
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AT89C51CC03U-RDTIM 数据表(HTML) 144 Page - ATMEL Corporation |
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144 / 195 page  144 AT89C51CC03 4182I–CAN–06/05 Figure 69. PCA Capture Mode 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 70. PCA 16-bit Software Timer and High Speed Output Mode CEXn n = 0, 4 PCA Counter CH (8bits) CL (8bits) CCAPnH CCAPnL CCFn CCON PCA Interrupt Request 7 CCAPMn Register (n = 0, 4) 0 CAPMn CAPNn ECOMn CAPPn MATn TOGn PWMn ECCFn CCAPnL (8 bits) CCAPnH (8 bits) 70 CCAPMn Register (n = 0, 4) CH (8 bits) 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 CAPMn CAPNn ECOMn CAPPn MATn TOGn PWMn ECCFn |
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