Siemens SIMATIC IPC477E PRO - Battery Status Register (Read Only, if the RTC_BAT_SURVEY_EN Address Is Set to 1; 404 Dh); NVRAM Address Register

Technical specifications
9.5 Hardware descriptions
SIMATIC IPC477E PRO
Operating Instructions, 08/2017, A5E39912462-AA
135
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
Meaning
7
6
5
4
3
2
1
0
0
0
CMOS battery capacity is still sufficient.
0 1 CMOS battery capacity is exhausted (remaining capacity is
sufficient for approx. one month)
1
1
CMOS battery is empty
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
PCI register content:
NVRAM memory address (default)
Length of the memory area
C2B0 0000 Address is assigned dynamically
(depending on device configura-
tion)
80000 h