Normal Operating State - Mitsubishi Electric M32R Series User Manual

17

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.
DC IN
Input
External circuit
RAM backup
signal (Note 1)
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.
Figure 17.3.2 Normal Operating State
17.3 Example of RAM Backup for Saving Power Consumption
Regulator
(3.3V system)
Regulator
(5V system)
IB
Regulator
(3.3V system)
"H"
Port X
(Note 2)
"H"
SBI
ADnINi
17-6
___
RAM backup power supply
Output
Output
Output
"H"
3.3V 3.3V
VCCI OSC-VCC VCCE
(Note 3)
M32R/E
RAM BACKUP MODE
5V 5V 5V
3.3V
VREFn AVCCn VDD
Ver.0.10