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SST89E58RD2-40-C-PI Datasheet(PDF) 55 Page - Silicon Storage Technology, Inc |
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SST89E58RD2-40-C-PI Datasheet(HTML) 55 Page - Silicon Storage Technology, Inc |
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55 / 91 page  Preliminary Specifications FlashFlex51 MCU SST89E52RD2 / SST89E54RD2 / SST89E58RD2 / SST89E516RD2 SST89V52RD2 / SST89V54RD2 / SST89V58RD2 / SST89V516RD2 55 ©2004 Silicon Storage Technology, Inc. S71255-00-000 3/04 8.3.1 Capture Mode Capture mode is used to capture the PCA timer/counter value into a module’s capture registers (CCAPnH and CCAPnL). The capture will occur on a positive edge, nega- tive edge, or both on the corresponding module’s pin. To use one of the PCA modules in the capture mode, either one or both the CCAPM bits CAPN and CAPP for that module must be set. When a valid transition occurs on the CEX pin corresponding to the module used, the PCA hard- ware loads the 16-bit value of the PCA counter register (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. In the interrupt service rou- tine, the 16-bit capture value must be saved in RAM before the next event capture occurs. If a subsequent capture occurred, the original capture values would be lost. After flag event flag has been set by hardware, the user must clear the flag in software. (See Figure 8-2) FIGURE 8-2: PCA CAPTURE MODE 1255 F24.0 CF CR CCF4 CCF3 CCF2 CCF1 CCF0 ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn CCON CCAPMn n=0 to 4 PCA Interrupt CH CL CCAPnH CCAPnL PCA Timer/Counter Capture CEXn 00 0 0 |
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