Let's hope the batteries never reach 223C, or I may have to get out some marshmelons.Not sure where you got that note? Must be old..
Temp in BATTSCI is simply offset by 32C~ or something IIRC.
If the MCM receives 00 hex it knows the temp is -32C (That's as low as it can go)
20 hex (32 Dec) would be 0C
It can receive values upto 255 - offset (32) = 223C