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32186 Datasheet(PDF) 875 Page - Renesas Technology Corp

Part # 32186
Description  MCU
PDF  1032 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

32186 Datasheet(HTML) 875 Page - Renesas Technology Corp

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RAM BACKUP MODE
19
19-3
32185/32186 Group Hardware Manual
Rev.1.10 REJ09B0235-0110 May 15, 07
19.2.1 Normal Operating State
Figure 19.2.2 shows the normal operating state of the M32R/ECU. During normal operation, input on the
SBI# pin or AD0INi (i = 0–15) pin which is used to detect a RAM backup signal remains "H."
Figure 19.2.2 Normal Operating State
Backup power supply
for power outage
Reference voltage for
power outage detection
Power outage
detection signal
"H"
3.3V or 5V
VREF0
SBI#
AD0INi
M32R/ECU
C
VCC
VDD
VBB
VREF
DC IN
(5V or 3.3V)
VDDE
AVCC0
OUT
VCCE,
VCCER
EXCVCC
EXCVDD
VCC-
BUS
3.3V or 5V
(Note 2)
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 "H" when the power is on and outputs "L" when the power is down.
Regulator
(Note 3)
Input
Output
(Note 1)
Backup battery
Power supply monitor IC
19.2 Example of RAM Backup when Power is Off
Figure 19.2.1 Typical Circuit for RAM Backup at Power Outage
VREF0
SBI#
AD0INi
M32R/ECU
(Note 2)
C
Backup battery
VCC
VDD
VBB
VREF
Reference voltage for
power outage detection
Power outage
detection signal
Backup power supply
for power outage
Output
Power supply monitor IC
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 "H" when the power is on and outputs "L" when the power is off.
DC IN Input
Regulator
(5V or 3.3V)
VDDE
AVCC0
OUT
VCCE,
VCCER
EXCVCC
EXCVDD
VCC-
BUS
(Note 3)
(Note 1)
19.2 Example of RAM Backup when Power is Off
A typical circuit for RAM backup at power outage is shown in Figure 19.2.1. The following explains how the
RAM can be backed up by using this circuit as an example.



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