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TS80C51RA2-VCKB Datasheet(PDF) 30 Page - ATMEL Corporation |
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TS80C51RA2-VCKB Datasheet(HTML) 30 Page - ATMEL Corporation |
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30 / 74 page  30 Rev. C - 06 March, 2001 TS80C51RA2/RD2 TS83C51RB2/RC2/RD2 TS87C51RB2/RC2/RD2 6.5.1. PCA Capture Mode To use one of the PCA modules in the capture mode either one or both of the CCAPM bits CAPN and CAPP for that module must be set. The external CEX input for the module (on port 1) is sampled for a transition. When a valid transition occurs the PCA hardware loads the value of the PCA counter registers (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 (Refer to Figure 9). Figure 9. PCA Capture Mode CF CR CCON 0xD8 CH CL CCAPnH CCAPnL CCF4 CCF3 CCF2 CCF1 CCF0 PCA IT PCA Counter/Timer ECOMn CCAPMn, n= 0 to 4 0xDA to 0xDE CAPNn MATn TOGn PWMn ECCFn CAPPn Cex.n Capture |
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