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T89C51CC02CA-RATIM Datasheet(PDF) 117 Page - ATMEL Corporation |
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T89C51CC02CA-RATIM Datasheet(HTML) 117 Page - ATMEL Corporation |
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117 / 159 page  117 AT/T89C51CC02 4126L–CAN–01/08 PCA Interrupt Figure 47. PCA Interrupt System PCA Capture Mode To use one of the PCA modules in 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 reg- isters (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. Figure 48. PCA Capture Mode CF CR CCON 0xD8 CCF1 CCF0 Module 1 Module 0 PCA Timer/Counter To Interrupt EC IEN0.6 EA IEN0.7 ECF CMOD.0 ECCFn CCAPMn.0 CEXn n = 0, 1 PCA Counter CH (8-bits) CL (8-bits) CCAPnH CCAPnL CCFn CCON Reg PCA Interrupt Request - 0CAPPnCAPNn000ECCFn 7 CCAPMn Register (n = 0, 1) 0 |
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