tmp1941af TOSHIBA Semiconductor CORPORATION, tmp1941af Datasheet - Page 353

• Manufacturer Part Number: tmp1941af
• Description: 32-bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Overflow Exception When a DSU Probe Is Used
IDLE (Doze) Mode
Problem:
Problem:
It looks as if an overflow exception caused a jump to the reset and nonmaskable exception vector address
(0xBFC0_0000).
A deadlock might occur when returning to normal operating mode from IDLE (Doze) mode.
•
•
Note:
Workaround:
Workaround:
Don’t place a jump or branch instruction immediately following an instruction that could cause an
overflow (ADD, ADDI or SUB).
If snooping is enabled, stop the DMAC before putting the processor in IDLE (Doze) mode.
Problem-Causing Situation:
Problem-Causing Situation:
When an overflow exception occurs, with the processor connected to a DSU probe
When the DMAC initiates a DMA transaction with snooping enabled after the Doze bit in the
Config register is set and before the CPU clock stops.
Toshiba’s compiler uses no instructions that could cause an overflow. Therefore, this
problem does not occur.
TMP1941AF-313
TMP1941AF
2003-03-27