M48Z35AV-10MH1F STMICROELECTRONICS [STMicroelectronics], M48Z35AV-10MH1F Datasheet - Page 12

• Manufacturer Part Number: M48Z35AV-10MH1F
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

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Also, as V
2.5V, an internal Battery Not OK (BOK) flag will be set. The BOK flag can be checked after
power up. If the BOK flag is set, the first WRITE attempted will be blocked. The flag is
automatically cleared after the first WRITE, and normal RAM operation resumes.
illustrates how a BOK check routine could be structured.
For more information on Battery Storage Life refer to the Application Note AN1012.
Figure 8.
CC
BOK check routine example
rises, the battery voltage is checked. If the voltage is less than approximately
(BATTERY OK)
COMPLEMENT BACK
TO SAME ADDRESS
AT ANY ADDRESS
WRITE ORIGINAL
ADDRESS AGAIN
SAME ADDRESS
DATA BACK TO
COMPLEMENT
WRITE DATA
READ DATA
READ DATA
POWER-UP
CONTINUE
AT SAME
OF FIRST
IS DATA
READ?
YES
NO
OF LOW BATTERY
(BATTERY LOW)
NOTIFY SYSTEM
(DATA MAY BE
CORRUPTED)
AI00607
Figure 8