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SST89E516RD2-40-I-NJE Datasheet(PDF) 52 Page - Silicon Storage Technology, Inc |
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SST89E516RD2-40-I-NJE Datasheet(HTML) 52 Page - Silicon Storage Technology, Inc |
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52 / 81 page  52 Data Sheet FlashFlex MCU SST89E516RD2 / SST89E516RD SST89V516RD2 / SST89V516RD ©2007 Silicon Storage Technology, Inc. S71273-03-000 1/07 8.3.3 High Speed Output Mode The high speed output mode is used to toggle a port pin when a match occurs between the PCA timer and the pre- loaded value in the compare registers. In this mode, the CEX output pin (on port 1) associated with the PCA mod- ule will toggle every time there is a match between the PCA counter (CH and CL) and the capture registers (CCAPnH and CCAPnL). To activate this mode, the user must set TOG, MAT, and ECOM bits in the module’s CCAPMn SFR. High speed output mode is much more accurate than tog- gling pins since the toggle occurs before branching to an interrupt. In this case, interrupt latency will not affect the accuracy of the output. When using high speed output, using an interrupt is optional. Only if the user wishes to change the time for the next toggle is it necessary to update the compare registers. Otherwise, the next toggle will occur when the PCA timer rolls over and matches the last compare value. (See Figure 8-4) FIGURE 8-4: PCA High Speed Output Mode 1273 F23.0 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 0 00 16-bit Comparator Reset Write to CCAPnL Write to CCAPnH 10 Enable Match CEXn Toggle |
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