22
22-6
Rev.1.0
22.3.2 Power-Shutdown Sequence When Using RAM Backup
The diagram below shows a power-shutdown sequence (5.0 V, 3.3 V power supply) of the M32R/
E when using RAM backup.
POWER-UP/POWER-SHUTDOWN SEQUENCE
22.3 Power-Shutdown Sequence
VCCE
AVCC0
VREF0
P72 / HREQ
RESET
VDD
VCCI
FVCC
OSC-VCC
5V
5V
5V
5V
5V
3.3V
3.3V
3.3V
3.3V
0V
0V
0V
0V
0V
0V
0V
0V
2.0V
2
1
3
3
4
➀
:
__________
Pull the HREQ pin input low to halt the CPU at end of bus cycle. Or disable RAM access
in software. The M32R/E allows P72 to be used as HREQ irrespective of its operation
mode.
➁
:
____________
With the CPU halted, pull the RESET pin input low. Or while RAM access is disabled, pull
____________
the RESET pin input low.
➂
:
____________
Turn off the 5 V and the 3.3 V power supply after the RESET pin goes low.
④
: Reduce the VDD voltage from 3.3 V to 2.0 V as necessary.
Note: Power-shutdown requirements
• VDD VCCI FVCC
• OSC-VCC VCCI
Figure 22.3.2 Power-Shutdown Sequence When Using RAM Backup
Содержание 32172
Страница 20: ... This is a blank page 16 ...
Страница 21: ...1 1 Overview 1 2 Block Diagram 1 3 Pin Functions 1 4 Pin Layout CHAPTER 1 CHAPTER 1 OVERVIEW ...
Страница 44: ...1 1 24 Rev 1 0 This is a blank page Overview 1 4 Pin Layout ...
Страница 58: ...2 2 14 Rev 1 0 This is a blank page CPU 2 6 Data Formats ...
Страница 122: ...4 4 26 Rev 1 0 This is a blank page EIT 4 13 Precautions on EIT ...
Страница 200: ...7 7 6 Rev 1 0 This is a blank page RESET 7 4 Precautions to Be Taken Immediately after Reset ...
Страница 240: ...8 8 40 Rev 1 0 This is a blank page INPUT OUTPUT PORTS AND PIN FUNCTIONS 8 5 Precautions on Input Output Ports ...
Страница 298: ...9 9 58 Rev 1 0 This is a blank page DMAC 9 4 Precautions on Using DMAC ...
Страница 416: ...10 10 118 Rev 1 0 This is a blank page INPUT OUTPUT TIMERS 10 6 TOM Output Related 16 bit Timers ...
Страница 658: ...14 14 16 Rev 1 0 REAL TIME DEBUGGER RTD 14 4 Typical Connection with the Host This is a blank page ...
Страница 718: ...16 16 16 Rev 1 0 This is a blank page D A CONVERTERS 16 3 Functional Description of the D A Converters ...
Страница 766: ...18 18 22 Rev 1 0 WAIT CONTROLLER 18 3 Typical Operation of the Wait Controller This is a blank page ...
Страница 776: ...19 19 10 Rev 1 0 RAM BACKUP MODE 19 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Страница 777: ...CHAPTER 20 CHAPTER 20 OSCILLATION CIRCUIT 20 1 Oscillator Circuit 20 2 Clock Generator Circuit ...
Страница 782: ...20 20 6 Rev 1 0 OSCILLATION CIRCUIT 20 2 Clock Generator Circuit This is a blank page ...
Страница 856: ...23 23 26 Rev 1 0 This is a blank page ELECTRICAL CHARACTERISTICS 23 6 AC Characteristics ...
Страница 857: ...24 1 A D Conversion Characteristics CHAPTER 24 CHAPTER 24 STANDARD CHARACTERISTICS ...
Страница 859: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Страница 861: ...Appendix 2 1 M32R E Instruction Processing Time APPENDIX 2 APPENDIX 2 INSTRUCTION PROCESSING TIME ...
Страница 865: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...