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TMP92CM22
2007-02-16
92CM22-214
7 6 5 4 3 2 1 0
Bit symbol WDTE WDTP1 WDTP0 − I2WDT RESCR − WDMOD
(1300H)
Read/Write R/W R/W
After reset 1 0 0 0 0 0 0
Function WDT control
1: Enable
Select detecting time
00: 2
15
/f
IO
01: 2
17
/f
IO
10: 2
19
/f
IO
11: 2
21
/f
IO
Always
write “0”
IDLE2
0: Stop
1: Operate
1: Internally
connects
WDT out
to the
reset pin
Always
write “0”
Watchdog timer out control
0 −
1 Connects WDT out to a reset
IDLE2 control
0 Stop
1 Operation
Watchdog timer detection time
00 2
15
/fIO (Approximately 3.28 ms at f
OSCH
= 40 MHz)
01 2
17
/f
IO
(Approximately 1.31 ms at f
OSCH
= 40 MHz)
10 2
19
/f
IO
(Approximately 52.4 ms at f
OSCH
= 40 MHz)
11 2
21
/f
IO
(Approximately 210 ms at f
OSCH
= 40 MHz)
Watchdog timer enable/disable control
0 Disabled
1 Enabled
Figure 3.12.4 Watchdog Timer Mode Register
7 6 5 4 3 2 1 0
Bit symbol − WDCR
(1302H)
Read/Write W
After reset −
Read
-modify
-write
instruction
is prohibited
Function B1H: WDT disable code
4EH: WDT clear code
WDT disable/clear control
B1H Disable code
4EH Clear code
Others Don’t care
Figure 3.12.5 Watchdog Timer Control Register