
17
17-8
Ver.0.10
RAM BACKUP MODE
17.3 Example of RAM Backup for Saving Power Consumption
Figure 17.3.4 Example of RAM Backup Sequence for Low-Power Operation
17.3.3 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 indeterminate. Therefore, be sure to set the output high level in the Port X Data
Register before you set port X for output mode. Unless this method is followed, port output may go
low at the same time port output is set after the clock oscillation has stabilized, causing the device
to enter RAM backup mode.
RESET
SBI
ADnINi
VCCI,
OSC-VCC
VDD
Oscillation
stabilization time
External input
signal goes low
RAM backup
period
Power on
Port X
Port input
mode
f (XIN)
Port output setting
(High level)
VCCE,
VREFn, AVCCn
3.3V
5.0V
0V
0V
Port output setting
(High level)
External input
signal goes high
Oscillation
stabilization time
Summary of Contents for M32170F3VFP
Page 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Page 56: ...2 2 14 Ver 0 10 This is a blank page ...
Page 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Page 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Page 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Page 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Page 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Page 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Page 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Page 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...