參數(shù)資料
型號(hào)： S1C6S460D
元件分類： 微控制器/微處理器
英文描述： 4-BIT, MROM, 2 MHz, MICROCONTROLLER, UUC124
封裝： 4.69 X 4.68 MM, DIE-124
文件頁(yè)數(shù)： 65/107頁(yè)
文件大小： 788K
代理商： S1C6S460D
52
EPSON
S1C6S460 TECHNICAL MANUAL
CHAPTER 8: TIMERS
8.2 Stopwatch Timer
8.2.1 Configuration of stopwatch timer
The S1C6S460 has 1/100 sec unit (SWL) and 1/10 sec unit (SWH) stopwatch timer built-in. The stopwatch
timer is configured with a 2 levels 4 bits BCD counter which has an input clock approximating 100 Hz
signal (signal divided from OSC1 to the closest 100 Hz) and data can be read in units of 4 bits by soft-
ware.
Figure 8.2.1.1 shows the configuration of the stopwatch timer.
10 Hz, 1 Hz
256 Hz
10 Hz
Stopwatch timer reset signal
Stopwatch timer RUN/STOP signal
Interrupt request
OSC1 oscillation
circuit
Divider
Data bus
SWL counter
SWH counter
Interrupt
control
Fig. 8.2.1.1 Configuration of stopwatch timer
The stopwatch timer can be used as a separate timer from the clock timer. In particular, digital watch
stopwatch functions can be realized easily with software.
8.2.2 Count-up pattern
The stopwatch timer is configured of 4 bits BCD counters SWL and SWH.
The counter SWL, at the stage preceding the stopwatch timer, has an approximated 100 Hz signal for the
input clock. It counts up every 1/100 sec, and generates an approximated 10 Hz signal. The counter SWH
has an approximated 10 Hz signal generated by the counter SWL for the input clock. In count-up every
1/10 sec, and generated 1 Hz signal.
Figure 8.2.2.1 shows the count-up pattern of the stopwatch timer.
26
256
26
256
26
256
26
256
26
256
26
256
25
256
25
256
25
256
25
256
3
256
2
256
3
256
2
256
2
256
2
256
3
256
3
256
3
256
2
256
3
256
2
256
3
256
3
256
3
256
3
256
3
256
2
256
2
256
2
256
26
256
25
256
26
256
25
256
x 6 +
x 4 = 1 (sec)
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1 Hz
signal
generation
Approximate
10 Hz
signal
generation
SWH count value
Count time (sec)
(sec)
SWL count value
Count time (sec)
SWL count value
Count time (sec)
SWH count-up pattern
SWL count-up pattern 1
SWL count-up pattern 2
Approximate
10 Hz
signal
generation
Fig. 8.2.2.1 Count-up pattern of stopwatch timer
SWL generates an approximated 10 Hz signal from the basic 256 Hz signal. The count-up intervals are 2/
256 sec and 3/256 sec, so that finally two patterns are generated: 25/256 sec and 26/256 sec intervals.
Consequently, these patterns do not amount to an accurate 1/100 sec.
SWH counts the approximated 10 Hz signals generated by the 25/256 sec and 26/256 sec intervals in the
ratio of 4 : 6, to generate a 1 Hz signal. The count-up intervals are 25/256 sec and 26/256 sec, which do
not amount to an accurate 1/10 sec.
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