Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 28 LOW-VOLTAGE DETECTOR (LVI)
R01UH0042EJ0500 Rev.5.00 Page 1344 of 1513
Aug 12, 2011
(2) Internal RAM data status register (RAMS)
The RAMS register is a special register. This can be written only in a special combination of sequences (see 3.4.8
Special registers).
This register is a flag register that indicates whether the internal RAM is valid or not.
This register can be read or written in 8-bit or 1-bit units.
The set/clear conditions for the RAMF bit are shown below.
• Setting conditions: Detection of voltage lower than specified level
Set by instruction
• Clearing condition: Writing of 0 in specific sequence
After reset: 01H
Note
R/W Address: FFFFF892H
7 6 5 4 3 2 1 <0>
RAMS 0 0 0 0 0 0 0 RAMF
RAMF Internal RAM voltage detection
0 Voltage lower than RAM retention voltage is not detected.
1 Voltage lower than RAM retention voltage is detected.
Note This register is reset only when a voltage drop below the RAM retention voltage is detected.