Normal Operating State - Mitsubishi Electric M32R Series User Manual

17

17.2.1 Normal Operating State

Figure 17.2.2 shows the normal operating state of the M32R/E. During normal operation, input on
_______
the SBI pin or ADnINi (i = 0-15) pin used for RAM backup signal detection remains high.
DC IN
Input
Regulator
(5V system)
Regulator
(3.3V system)
(Note 1)
Reference voltage for
power outage detection
Backup battery
Note 1 : Power outage is detected by the DC IN (regulator input) voltage.
Note 2 : These pins are used to detect a RAM backup signal.
Note 3 : This pin outputs a high when the power is on and outputs a low when the power is down.
Note 4 : Backup power supply = 2.0 to 3.3 V
Figure 17.2.2 Normal Operating State
17.2 Example of RAM Backup when Power is Down
Output
Output
Power supply
C
monitor IC
Backup power supply
for power outage
VCC VDD
VREF
(Note 3)
Power outage
detection signal
OUT
VBB
"H"
17-3
RAM BACKUP MODE
(Note 4)
3.3V 3.3V 3.3V
VDD VCCI OSC-VCC
SBI
(Note 2)
ADnINi
M32R/E
5V 5V 5V
VCCE VREFn AVCCn
Ver.0.10