Datasheet

V850ES/JG3 CHAPTER 10 WATCH TIMER FUNCTIONS
R01UH0015EJ0300 Rev.3.00 Page 389 of 870
Sep 30, 2010
(3) Watch timer operation mode register (WTM)
The WTM register enables or disables the count clock and operation of the watch timer, sets the interval time of
the prescaler, controls the operation of the 5-bit counter, and sets the set time of the watch flag.
Set the PRSM0 register before setting the WTM register.
This register can be read or written in 8-bit or 1-bit units.
Reset sets this register to 00H.
(1/2)
WTM7
2
4
/f W (488 s: f W = f XT )
2
5
/f W (977 s: f W = f XT )
2
6
/f W (1.95 ms: f W = f XT )
2
7
/f W (3.91 ms: f W = f XT )
2
8
/f W (7.81 ms: f W = f XT )
2
9
/f W (15.6 ms: f W = f XT )
2
10
/f W (31.3 ms: f W = f XT )
2
11
/f W (62.5 ms: f W = f XT )
2
4
/f W (488 s: f W = f BRG )
2
5
/f W (977 s: f W = f BRG )
2
6
/f W (1.95 ms: f W = f BRG )
2
7
/f W (3.90 ms: f W = f BRG )
2
8
/f W (7.81 ms: f W = f BRG )
2
9
/f W (15.6 ms: f W = f BRG )
2
10
/f W (31.2 ms: f W = f BRG )
2
11
/f W (62.5 ms: f W = f BRG )
WTM7
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
WTM6
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Selection of interval time of prescaler
WTM WTM6 WTM5 WTM4 WTM3 WTM2 WTM1 WTM0
WTM5
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
WTM4
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
After reset: 00H R/W Address: FFFFF680H
μ
μ
μ
μ
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