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7721 Datasheet(PDF) 530 Page - Renesas Technology Corp

Part # 7721
Description  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7721 Datasheet(HTML) 530 Page - Renesas Technology Corp

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APPENDIX
7721 Group User’s Manual
17–67
Appendix 9. 7721 Group Q & A
Reset, STP instruction, WIT instruction
Q
Is it possible to distinguish power-on reset from hardware reset for terminating the stop or wait mode
?
A
The contents of the internal RAM is undefined after power-on reset. On the other hand, the contents
of the internal RAM are retained when performing hardware reset in the stop or wait mode with Vcc
≥ 2 V.
Accordingly, write a certain data to the internal RAM before executing STP or WIT instruction, and
judge by checking the contents of the internal RAM after hardware reset.



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