Battery Status Register (Read Only, If The Rtc_Bat_Survey_En Address Is Set To "1"; 404Dh); Nvram Address Register - Siemens SIMATIC IPC477E PRO Operating Instructions Manual

9.5.3.4 Battery status register (read only, if the RTC_BAT_SURVEY_EN address is set to "1";
404Dh)
The status of the CMOS battery is monitored when the GPIO "RTC_BAT_SURVEY_EN" is
set to '1'; the status (two-tier) can be read from the battery status register.
Meaning of the bits
Battery status register (read-only, if enabled with RTC_BAT_SURVEY_EN, address 404Dh)
Bit
7
0
0
1
9.5.3.5

NVRAM address register

NVRAM occupies a 512 KB memory address area that can be read via PCI registers.
Meaning of the bits
NVRAM address register
PCI register address:
NVRAM base address regis-
ter
C2B0 0000
SIMATIC IPC477E PRO
Operating Instructions, 08/2017, A5E39912462-AA
6 5 4 3 2 1
0
1
1
Meaning
0
CMOS battery capacity is still sufficient.
CMOS battery capacity is exhausted (remaining capacity is
sufficient for approx. one month)
CMOS battery is empty
PCI register content:
NVRAM memory address (default)
Address is assigned dynamically
(depending on device configura-
tion)
Technical specifications
9.5 Hardware descriptions
Length of the memory area
80000 h
135