Fujitsu FR81S User Manual
CHAPTER 18: WATCHDOG TIMER
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : WATCHDOG TIMER
FUJITSU SEMICONDUCTOR CONFIDENTIAL
12
4.3. Watchdog Timer 0 Extended Configuration Register :
WDTECR0 (Watchdog Timer Extended Configuration
Register 0)
Register 0)
The bit configuration of the watchdog timer 0 Extended Configuration Register is shown.
This register configures the settings for window watching function of the watchdog timer 0.
WDTECR0 : Address 0038
H
(Access: Byte, Half-word, Word)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Reserved
WTWE
WTLI[3:0]
Initial value
0
0
0
0
0
0
0
0
Attribute R0,W0 R0,W0 R0,W0 R0,W
R0,W
R0,W
R0,W
R0,W
[bit7 to bit5] Reserved: (Reserved bits)
Be sure to write "0" to this bit. The read value is "0".
[bit4] WTWE (Watchdog Timer Window Enable) : Watchdog Timer Window Function Enable
This bit controls the window function of the watchdog timer 0. When the bit WTWE is set to "0" the
window function becomes enabled.
The initial value of this bit is "0". (The window function is invalid.)
WTWE[3:0]
Window function enabled
0
Window function is invalid (initial value)
1
Window function is valid
[bit3 to bit0] WTLI[3:0] (Watchdog Timer Lower Interval) : Selection of the lower limit of watchdog
timer
These bits configure the lower limit of the interval starting from when the watchdog timer 0 is cleared to
when it is cleared next time. When the window function is valid, if a request for clearing the watchdog
timer 0 comes before a lower limit of timer shown below, a watchdog reset signal is issued.
WTLI[3:0]
The Lower Limit of the Watchdog Timer
0000
PCLK (Peripheral Clock) × 2
8
cycles
0001
PCLK × 2
9
cycles
0010
PCLK × 2
10
cycles
0011
PCLK × 2
11
cycles
0100
PCLK × 2
12
cycles
0101
PCLK × 2
13
cycles
0110
PCLK × 2
14
cycles
0111
PCLK × 2
15
cycles
1000
PCLK × 2
16
cycles
1001
PCLK × 2
17
cycles
1010
PCLK × 2
18
cycles
MB91520 Series
MN705-00010-1v0-E
621