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: 215/fIO
01: 217/fIO
10: 219/fIO
11: 221/fIO
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
00 215/fIO (Approximately 3.28 ms at fOSCH = 40 MHz)
01 217/fIO (Approximately 1.31 ms at fOSCH = 40 MHz)
10 219/fIO(Approximately 52.4 ms at fOSCH = 40 MHz)
11 221/fIO (Approximately 210 ms at fOSCH = 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