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32186 Datasheet(PDF) 877 Page - Renesas Technology Corp |
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32186 Datasheet(HTML) 877 Page - Renesas Technology Corp |
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877 / 1032 page  RAM BACKUP MODE 19 19-5 32185/32186 Group Hardware Manual Rev.1.10 REJ09B0235-0110 May 15, 07 Port X IB DC IN Output Output VREF0 SBI# AD0INi M32R/ECU VDDE AVCC0 VCCE, VCCER EXCVCC EXCVDD VCC- BUS (5V or 3.3V) (5V or 3.3V) RAM backup signal External circuit (Note 1) (Note 3) RAM backup power supply Regulator Input Regulator (Note 2) Note 1: This circuit outputs "L" during RAM backup. Note 2: This port outputs "H" 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 19.3.1 Typical RAM Backup Circuit for Saving Power Consumption 19.3 Example of RAM Backup for Saving Power Consumption A typical RAM backup circuit for saving the microcomputer’s power consumption is shown in Figure 19.3.1. The following explains how the RAM is backed up for the purpose of low-power operation by using this circuit as an example. 19.3 Example of RAM Backup for Saving Power Consumption |
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