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T89C51AC2-RLSI-M 数据表(PDF) 77 Page - ATMEL Corporation |
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T89C51AC2-RLSI-M 数据表(HTML) 77 Page - ATMEL Corporation |
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77 / 117 page ![]() Draft.A - March 30, 2001 77 Preview - Confidential T89C51AC2 15.3. 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 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. Figure 66. PCA Capture Mode CEXn n = 0, 4 PCA Counter CH (8bits) CL (8bits) CCAPnH CCAPnL CCFn CCON Reg PCA Interrupt Request - 0CAPPnCAPNn000 ECCFn 7 CCAPMn Register (n = 0, 4) 0 |
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