11 Feb
2005
11 Feb
'05
1 p.m.
Hi en4rab,
If the E3 behaves like the E2 did it will have its WDT enabled and locked so about 4 or 5 seconds after you halt the CPU the WDT will time out and reset the box
Code to reset the watch-dog's timer writes 0x0000a5a5 to 0xffff8004.
e3a0c9fe mov r12, #&3f8000 e24cc501 sub r12, r12, #&400000 # r12 = 0xffff8000 = WDT. e3a030a5 mov r3, #&a5 e2833ca5 add r3, r3, #&a500 # r3 = 0xa5a5. e58c3004 str r3, [r12, #4] # wdtcntr.
Presumably, something similar could be done with JTAG to disable the WDT completely?
Cheers,
Ralph.