17
17-6
Ver.0.10
RAM BACKUP MODE
17.3 Example of RAM Backup for Saving Power Consumption
Figure 17.3.2 Normal Operating State
Note 1 : This signal outputs a low for RAM backup.
Note 2 : This pin outputs a high when the power is on, and is set for input mode when in RAM backup
mode.
Note 3 : These pins are used to detect a RAM backup signal.
17.3.1 Normal Operating State
Figure 17.3.2 shows the normal operating state of the M32R/E. During normal operation, the RAM
___
backup signal output by the external signal is high. Also, input on the SBI pin or ADnINi (i = 0-15) pin
used for RAM backup signal detection remains high.
Port X, which is the transistor's base connecting pin, should output a high. This causes the
transistor's base voltage, IB, to go high, so that current is fed from the power supply to the VCC pin
via the transistor.
RAM backup
signal (Note 1)
External circuit
Port X
IB
RAM backup power supply
DC IN
Input
Output
Regulator
(3.3V system)
Output
Regulator
(5V system)
Output
Regulator
(3.3V system)
VREFn
SBI
ADnINi
M32R/E
VDD
VCCI
AVCCn
OSC-VCC VCCE
(Note 3)
(Note 2)
5V
3.3V
5V
3.3V
5V
3.3V
"H"
"H"
"H"
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 ...