Watch Timer Control Register (Wtc) - Fujitsu MB90895 Series Hardware Manual

9.3.1

Watch timer control register (WTC)

This section explains the functions of the watch timer control register (WTC).
I Watch timer control register (WTC)
7 6
R/W R
R/W : Read/Write
R : Read only
X : Undefined
SCLK : Subclock
: Reset value
The values in "()" are the calculated example at subclock = 8.192 kHz.
Figure 9.3-2 Watch timer control register (WTC)
5 4 3 2 1 0
R/W R/W R/W R/W R/W R/W
Reset value
1X001000
B
bit2 bit1 bit0
WTC2 WTC1 WTC0 Interval time select bit
8
2 /SCLK (31.25ms)
0 0 0
9
2 /SCLK (62.5ms)
0 0 1
10
2 /SCLK (125ms)
0 1 0
11
2 /SCLK (250ms)
0 1 1
12
2 /SCLK (500ms)
1 0 0
13
1 0 1 2 /SCLK (1.0s)
14
1 1 0 2 /SCLK (2.0s)
15
2 /SCLK (4.0s)
1 1 1
bit3
Watch timer clear bit
WTR
Read
0 -
1
"1" is always read.
bit4
over flow flag bit
WTOF
Read
0 Without over flow of corresponding
bit within setting interval time
1
With over flow of corresponding bit
within setting interval time
bit5
Over flow interrupt enable bit
WTIE
Interrupt request disabled
0
1 Interrupt request enabled
bit6
Oscillation stabilization waiting time finish bit
SCE
Oscillation stabilization waiting state
0
Oscillation stabilization waiting time finish
1
bit7
Watchdog clock select bit
(Input clock of watchdog timer)
WDCS
Main of PLL clock mode
0
Watch timer
Time base timer
1
CHAPTER 9 Watch timer
Write
Clear watch timer counter
No effection
Write
Clear WTOF bit
No effection
Sub clock mode
Set "0".
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