Example Of Ram Backup For Saving Power Consumption - Mitsubishi Electric M32R Series User Manual

Mitsubishi 32-bit risc single-chip microcomputers

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17.3 Example of RAM Backup for Saving Power Consumption

Figure 17.3.1 shows a typical circuit for RAM backup to save on power consumption. The following

explains how the RAM is backed up for the purpose of low-power operation by using this circuit as

External circuit

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

Note 3 : These pins are used to detect a RAM backup signal.

Figure 17.3.1 Typical Circuit for RAM Backup to Save on Power Consumption

17.3 Example of RAM Backup for Saving Power Consumption

(3.3V system)

(3.3V system)

RAM BACKUP MODE

RAM backup power supply

OSC-VCC VCCE