NEC ?PD703302, User Manual

Page: 343 / 709

CHAPTER 10 INTERVAL TIMER, WATCH TIMER
User’s Manual U16896EJ2V0UD
343
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
(3.91 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
(31.3 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 timer interrupt (INTWTI) time
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
2
14
/f
W
(0.5 s: f
W
= f
XT
)
2
13
/f
W
(0.25 s: f
W
= f
XT
)
2
5
/f
W
(977 s: f
W
= f
XT
)
2
4
/f
W
(488 s: f
W
= f
XT
)
2
14
/f
W
(0.5 s: f
W
= f
BRG
)
2
13
/f
W
(0.25 s: f
W
= f
BRG
)
2
5
/f
W
(977 s: f
W
= f
BRG
)
2
4
/f
W
(488 s: f
W
= f
BRG
)
WTM7
0
0
0
0
1
1
1
1
Selection of watch timer interrupt (INTWT) time
Clear after operation stops
Start
WTM1
0
1
Control of 5-bit counter operation
WTM3
0
0
1
1
0
0
1
1
WTM2
0
1
0
1
0
1
0
1
Stop operation (clear both prescaler and 5-bit counter)
Enable operation
WTM0
0
1
Watch timer operation enable
μ
μ
μ
μ
Caution Rewrite the WTM2 to WTM7 bits while both the WTM0 and WTM1 bits are 0.
Remarks 1. f
W
: Watch timer clock frequency
2. Values in parentheses apply when f
W
= 32.768 kHz