參數(shù)資料
型號： S1C60N08F0A0100
元件分類： 微控制器/微處理器
英文描述： MICROCONTROLLER, PQFP100
封裝： PLASTIC, QFP-100
文件頁數(shù)： 109/145頁
文件大?。?/td> 1118K
代理商： S1C60N08F0A0100
I-54
EPSON
S1C60N08 TECHNICAL HARDWARE
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (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.
4.10.3 Interrupt function
The 10 Hz (approximate 10 Hz) and 1 Hz interrupts can be generated through the overflow of stopwatch
timers SWL and SWH respectively. Also, software can set whether to separately mask the frequencies
described earlier.
Figure 4.10.3.1 is the timing chart for the stopwatch timer.
Address
Register
Stopwatch timer (SWL) timing chart
Stopwatch timer (SWH) timing chart
10 Hz interrupt request
1 Hz interrupt request
2E2H
1/10 sec
(BCD)
2E1H
1/100 sec
(BCD)
D0
D1
D2
D3
D0
D1
D2
D3
Fig. 4.10.3.1 Stopwatch timer timing chart
As shown in Figure 4.10.3.1, the interrupts are generated by the overflow of their respective counters ("9"
changing to "0"). Also, at this time the corresponding interrupt factor flags (SWIT0, SWIT1) are set to "1".
The respective interrupts can be masked separately through the interrupt mask registers (EISWIT0,
EISWIT1). However, regardless of the setting of the interrupt mask registers, the interrupt factor flags are
set to "1" by the overflow of their corresponding counters.
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