NUC910ABN Datasheet, PDF (495/669 Pages) Nuvoton Technology Corporation – 32-bit ARM926EJ-S Based Microcontroller

NUC910ABN
[5:4]
[3]
[2]
[1]
[0]
WTIS
WTIF
WTRF
WTRE
WTR
32-BIT ARM926EJ-S BASED MCU
Watchdog Timer Interval Select
These two bits select the interval for the watchdog timer. No matter which
interval is chosen, the reset time-out is always occurred 1024 clocks later
than the interrupt time-out.
WTIS
00
01
10
11
Interrupt
Timeout
2¹⁴ clocks
2¹⁶ clocks
2¹⁸ clocks
2²⁰ clocks
Reset Timeout
2¹⁴ + 1024 clocks
2¹⁶ + 1024 clocks
2¹⁸ + 1024 clocks
2²⁰ + 1024 clocks
Real Time Interval
(CLK=15MHz/256)
0.28 sec.
1.12 sec.
4.47 sec.
17.9 sec.
Watchdog Timer Interrupt Flag
If the watchdog interrupt is enabled, then the hardware will set this bit to
indicate that the watchdog interrupt has occurred. If the watchdog interrupt
is not enabled, then this bit indicates that a time-out period has elapsed.
0 = Watchdog timer interrupt does not occur
1 = Watchdog timer interrupt occurs
NOTE: This bit is read only, but can be cleared by writing 1 to this bit.
Watchdog Timer Reset Flag
When the watchdog timer initiates a reset, the hardware will set this bit. This
flag can be read by software to determine the source of reset. Software is
responsible to clear it up manually. If WTRE is disabled, then the watchdog
timer has no effect on this bit.
0 = Watchdog timer reset does not occur
1 = Watchdog timer reset occurs
Watchdog Timer Reset Enable
Setting this bit will enable the watchdog timer reset function.
0 = Disable watchdog timer reset function
1 = Enable watchdog timer reset function
NOTE: This bit is read only, but can be cleared by writing 1 to this bit.
Watchdog Timer Reset
This bit brings the watchdog timer into a known state. It helps reset the
watchdog timer before a time-out situation occurring. Failing to set WTR
before time-out will initiates an interrupt if WTIE is set. If WTRE is set, a
watchdog timer reset will be generated 512 clocks after time-out. This bit is
self-clearing.
0 = No operation
1 = Reset the contents of the watchdog timer
Publication Release Date: Jun. 18, 2010
495
Revision: A4