Figure 6.3 Watchdog Timer Control Register (Wdtc) - Fujitsu F2MC-8L MB89620 Series Hardware Manual

3
6. Watchdog Timer Control Register (WDTC)
The watchdog timer control register (WDTC) is used to activate or clear the watchdog
timer.
n Watchdog Timer Control Register (WDTC)
Address
0009
H
W
—
X
Note: As the register is write-only, the bit manipulation instructions cannot be used.
Table 6.3 Watchdog Timer Control Register (WDTC) Bits
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
132
CHAPTER 6 WATCHDOG TIMER
Bit 7 Bit 6 Bit 5
— — —
: Write-only
: Unused
: Indeterminate
: Initial value

Figure 6.3 Watchdog Timer Control Register (WDTC)

Bit
• The read value is indeterminate.
Unused bits
• Writing to these bits has no effect on the operation.
• Writing "0101
WTE3 to WTE0:
Watchdog timer
• Writing a value other than "0101
control bits
Check: The read value is "1111
Bit 4 Bit 3 Bit 2 Bit 1
— WTE3 WTE2 WTE1
W W W
WTE3 WTE2 WTE1 WTE0
0 1 0 1
Other than the above
" to these bits activates (when writing for the first time after a
B
reset) or clears (when writing for the second and subsequent times after a
reset) the watchdog timer.
used.
Bit 0 Initial value
WTE0 XXXXXXXX
B
W
Watchdog timer control bits
• Activate the watchdog timer
(when writing for the first time after a
reset).
• Clear the watchdog timer
(when writing for the second and
subsequent times after a reset).
No operation
Function
" has no effect on the operation.
B
". The bit manipulation instructions cannot be
B
MB89620 series