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參數(shù)資料
| 型號(hào)： | UPD4990A |
| 廠商： | NEC Corp. |
| 英文描述： | SERIAL I/O CALENDAR & CLOCK CMOS LSI |
| 中文描述： | 串行I / O日歷 |
| 文件頁(yè)數(shù)： | 9/20頁(yè) |
| 文件大?。?/td> | 129K |
| 代理商： | UPD4990A |
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9
μ
PD4990A
°
Interval output function
An interrupt signal can be output by selecting an output from TP.
Interrupt signals are output repeatedly at specified intervals until their output is suppressed by a command.
Only output flags can be reset to operate the timer continuously.
The interval signal waveform is rectangular (50 % duty) if not reset.
The interval timer is independent of the Timer Counter, so it is not affected by the resetting of the current
time timer.
The interval timer accuracy is
±
15.625 ms.
* The interval timer counter is reset by [1, 0, 0, 0] through [1, 0, 1, 1].
0.5 s
1 s
1 s
Interval of 1 second
Interval Output
Flag Reset
Interval Timer
Clock Stop
1 s
60 s
30 s
Interval Output
Flag Reset
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