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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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UPD17708 데이터시트(PDF) 312 Page - Renesas Technology Corp |
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UPD17708 데이터시트(HTML) 312 Page - Renesas Technology Corp |
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312 / 358 page  310 µPD17704, 17705, 17707, 17708, 17709 Figure 21-4. CE Reset Operation with Clock Stop Instruction 21.2.3 Cautions on CE reset Because CE reset is effected regardless of the instruction under execution, the following points (1) and (2) must be noted. (1) Time to execute timer processing such as watch When creating a watch program by using the basic timer 0 carry, the processing time of the program must be kept to within a specific time. For details, refer to 13.2.6 Cautions on using basic timer 0. (2) Processing of data and flags used in program Exercise care in rewriting the data and flags whose contents must not be changed even when CE reset is effected, such as security code. An example is shown below. VDD CE XOUT BTM0CY flag setting pulse CE reset timer carry counter Set value of CE reset timer carry counter Normal operation 5 V 0 V H L H L H L H L H H L L tSET N1 1 0 Clock stop status Halt status tSET/2 STOP s instruction Clock stop status released. Oscillation starts CE reset Program execution starts from address 0 CE reset signal |
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