The TS-8820 provides 2MB of battery backed static RAM. The RAM is accessed through a 4KB memory window. After programming the SRAM page register, 16 bit reads or writes can be performed to any part of the page.
This can be accessed through ts8820ctl:
echo "test" | ts8820ctl -W 5 ts8820ctl -R 5
|Note:||The SRAM is not populated by default. See U16 to verify the presence on your board. If you require battery backed SRAM please contact us.|