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SST89E58RD2-40-C-NJ Datasheet(PDF) 48 Page - Silicon Storage Technology, Inc |
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SST89E58RD2-40-C-NJ Datasheet(HTML) 48 Page - Silicon Storage Technology, Inc |
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48 / 81 page  48 Data Sheet FlashFlex51 MCU SST89E52RD2/RD / SST89E54RD2/RD / SST89E58RD2/RD SST89V52RD2/RD / SST89V54RD2/RD / SST89V58RD2/RD ©2006 Silicon Storage Technology, Inc. S71255-05-000 5/06 8.3 Compare/Capture Modules Each PCA module has an associated SFR with it. These registers are: CCAPM0 for module 0, CCAPM1 for module 1, etc. Refer to “PCA Compare/Capture Module Mode Reg- ister (CCAPMn)” on page 28 for details. The registers each contain 7 bits which are used to control the mode each module will operate in. The ECCF bit (CCAPMn.0 where n = 0, 1, 2, 3, or 4 depending on module) will enable the CCF flag in the CCON SFR to generate an interrupt when a match or compare occurs. PWM (CCAPMn.1) enables the pulse width modulation mode. The TOG bit (CCAPMn.2) when set, causes the CEX output associated with the mod- ule to toggle when there is a match between the PCA counter and the module’s capture/compare register. When there is a match between the PCA counter and the mod- ule’s capture/compare register, the MATn (CCAPMn.3) and the CCFn bit in the CCON register to be set. Bits CAPN (CCAPMn.4) and CAPP (CCAPMn.5) deter- mine whether the capture input will be active on a positive edge or negative edge. The CAPN bit enables the negative edge that a capture input will be active on, and the CAPP bit enables the positive edge. When both bits are set, both edges will be enabled and a capture will occur for either transition. The last bit in the register ECOM (CCAPMn.6) when set, enables the comparator function. Table 8-5 shows the CCAPMn settings for the various PCA functions. There are two additional register associated with each of the PCA modules: CCAPnH and CCAPnL. They are regis- ters that hold the 16-bit count value when a capture occurs or a compare occurs. When a module is used in PWM mode, these registers are used to control the duty cycle of the output. See Figure 8-1. TABLE 8-4: PCA High and Low Register Compare/Capture Modules Symbol Description Direct Address Bit Address, Symbol, or Alternative Port Function RESET Value MSB LSB CCAP0H PCA Module 0 Compare/Capture Registers FAH CCAP0H[7:0] 00H CCAP0L EAH CCAP0L[7:0] 00H CCAP1H PCA Module 1 Compare/Capture Registers FBH CCAP1H[7:0] 00H CCAP1L EBH CCAP1L[7:0] 00H CCAP2H PCA Module 2 Compare/Capture Registers FCH CCAP2H[7:0] 00H CCAP2L ECH CCAP2L[7:0] 00H CCAP3H PCA Module 3 Compare/Capture Registers FDH CCAP3H[7:0] 00H CCAP3L EDH CCAP3L[7:0] 00H CCAP4H PCA Module 4 Compare/Capture Registers FEH CCAP4H[7:0] 00H CCAP4L EEH CCAP4L[7:0] 00H T8-4.0 1255 |
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