Appendix 4
Appendix
4-19
32180 Group User's Manual (Rev. 1.0)
SUMMARY OF PRECAUTIONS
Appendix 4.11 Precautions about RAM Backup Mode
Appendix 4.11 Precautions about RAM Backup Mode
Appendix 4.11.1 Precautions to Be Observed at Power-On
When changing port X from input mode to output mode after power-on, pay attention to the following.
If port X is set for output mode while no data is set in the Port X Data Register, the port’s initial output level is instable.
Therefore, before changing port X for output mode, make sure the Port X Data Register is set to output a high.
Unless this precaution is followed, port output may go low at the same time the port is set for output after the
oscillation has stabilized, causing the microcomputer to enter RAM backup mode.
Summary of Contents for M32R/ECU Series
Page 17: ...12 This page is blank for reasons of layout...
Page 712: ...CHAPTER 18 OSCILLATOR CIRCUIT 18 1 Oscillator Circuit 18 2 Clock Generator Circuit...
Page 794: ...CHAPTER 22 TYPICAL CHARACTERISTICS...
Page 796: ...APPENDIX 1 MECHANICAL SPECIFICAITONS Appendix 1 1 Dimensional Outline Drawing...
Page 798: ...APPENDIX 2 INSTRUCTION PROCESSING TIME Appendix 2 1 32180 Instruction Processing Time...
Page 802: ...APPENDIX 3 PROCESSING OF UNUSED PINS Appendix 3 1 Example Processing of Unused Pins...
