Possibly power reg for T650 bluetooth

BT on:

08000044: 001f00fa001800bc

BT off:

08000044: 001f00ff00180080
                        ^^

Writing the ff into 0x44 had no effect, but 0x80 into 0x48 killed the connection. :D

bit 2: no effect
bit 3: no effect
bit 4: breaks connection
bit 5: breaks connection

Bingo! I'd say 4 and 5 are BT power and reset (although which is which?). Overwriting 0x0 (RBR/THR) also kills the connection while powering down BTUART has no effect indicating it's definately connect to ASIC UART.