
M451
May. 4, 2018
Page
542
of
1006
Rev.2.08
M4
51
S
E
RI
E
S
T
E
CH
NICA
L RE
F
E
R
E
NC
E
M
A
NU
A
L
011
2
10
* T
WDT
(3/18/130/1026) * T
WDT
100
2
12
* T
WDT
(3/18/130/1026) * T
WDT
101
2
14
* T
WDT
(3/18/130/1026) * T
WDT
110
2
16
* T
WDT
(3/18/130/1026) * T
WDT
111
2
18
* T
WDT
(3/18/130/1026) * T
WDT
Table 6-17 Watchdog Timer Time-out Interval Period Selection
T
TIS
WDT reset
(low reset)
T
RSTD
T
RST
T
WDT
·
T
WDT
: Watchdog Clock Time Period
·
T
TIS
: Watchdog Time-out Interval Period ( (2
4
~ 2
18
) * T
WDT
)
·
T
RSTD
: Watchdog Reset Delay Period
- Selectable 3/18/130/1026 * T
WDT
delay period controlled
by RSTDSEL(WDT_ALTCTL [1:0])
·
T
RST
: Watchdog Reset Period ( 63 * T
WDT
)
WDT_CLK
IF = 1
RSTF = 1
(if RSTEN = 1)
IF
RSTF
Figure 6.10-3 Watchdog Timer Time-out Interval and Reset Period Timing
WDT Wake-up
6.10.6.3
If WDT clock source is selected to LIRC or LXT, system can be waken-up from Power-down
mode while WDT time-out interrupt signal is generated and WKEN (WDT_CTL[4]) enabled. In
the meanwhile, the WKF (WDT_CTL[5]) will set to 1 automatically, user can check WKF
(WDT_CTL[5]) status by software to recognize the system has been waken-up by WDT time-out
interrupt or not.