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AT89C51AC3-RDTIM Datasheet(PDF) 97 Page - ATMEL Corporation |
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AT89C51AC3-RDTIM Datasheet(HTML) 97 Page - ATMEL Corporation |
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97 / 143 page  97 AT89C51AC3 4383B–8051–01/05 Figure 55. 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 56. 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 - 0CAPPn CAPNn 000 ECCFn 7 CCAPMn Register (n = 0, 4) 0 CCAPnL (8 bits) CCAPnH (8 bits) - ECOMn0 0 MATn TOGn0 ECCFn 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 |
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