NEC PD754144 - Manual (Page 117)

CHAPTER 6 PERIPHERAL HARDWARE FUNCTION
117 User’s Manual U10676EJ3V0UM
6.3.3 Watchdog timer enable flag (WDTM)
WDTM is a flag that enables assertion of the reset signal when an overflow occurs.
This flag is set by a bit manipulation instruction. Once this flag has been set, it cannot be cleared by an instruction.
Example To set watchdog timer function
SEL MB15 ; or CLR1 MBE
SET1 WDTM
•
•
•
SET1 BTM.3 ; Sets bit 3 of BTM to “1”
The contents of this flag are cleared to 0 when the RESET signal is asserted.
Figure 6-22. Format of Watchdog Timer Enable Flag (WDTM)
WDTM
0
BT mode
Sets IRQBT when basic interval timer (BT) overflows
Address
F8BH.3
1
WT mode
Asserts internal reset signal when basic interval timer
(BT) overflows