If my memory doesn't fail me:
battery error code T1331:
the path for it is:
subsys--------------block------------area------------routine
Timebase -----TBC control------ Static RAM-----Battery
this means cpu communicates with NVRAM in two ways:
1.While Supplying 5V to SRAM.
2.Without supplying 5V to SRAM,check battery status.
I did checked the vcc pins of two SRAMs on DS1213 sockets after removing them from timebase board.
one is 3.05Vdc,another is 2.7 Vdc,the last one failed, 2.7V is just a little bit below the threshold I guess.
