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參數(shù)資料
| 型號： | S1C63455F |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 4.1 MHz, MICROCONTROLLER, PQFP128 |
| 封裝： | PLASTIC, QFP5-128 |
| 文件頁數(shù)： | 104/119頁 |
| 文件大?。?/td> | 865K |
| 代理商： | S1C63455F |
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S1C63455 TECHNICAL MANUAL
EPSON
77
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Sound Generator)
4.12.6 One-shot output
The sound generator has a one-shot output function for outputting a short duration buzzer signal for key
operation sounds and similar effects. Either 125 msec or 31.25 msec can be selected by SHTPW register
for one-shot buzzer signal output time.
The output of the one-shot buzzer is controlled by writing "1" into the one-shot buzzer trigger BZSHT.
When this trigger has been assigned, a buzzer signal in synchronization with the internal 256 Hz signal is
output from the BZ terminal. Thereafter, when the set time has elapsed, a buzzer signal in synchroniza-
tion with the 256 Hz signal goes off in the same manner as for the start of output.
The BZSHT also permits reading. When BZSHT is "1", the one-shot output circuit is in operation (during
one-shot output) and when it is "0", it shows that the circuit is in the ready (outputtable) status.
In addition, it can also terminate one-shot output prior to the elapsing of the set time. This is done by
writing a "1" into the one-shot buzzer stop BZSTP. In this case as well, the buzzer signal goes OFF in
synchronization with the 256 Hz signal.
When "1" is written to BZSHT again during a one-shot output, a new one-shot output for 125 msec or
31.25 msec starts from that point (in synchronization with the 256 Hz signal).
The one-shot output cannot add an envelope for short durations. However, the sound level can be set by
selecting the duty ratio, and the frequency can also be set.
One-shot output is invalid during normal buzzer output (during BZE = "1").
Figure 4.12.6.1 shows timing chart for one-shot output.
256 Hz
SHTPW
BZSHT (W)
BZSHT (R)
BZSTP
BZ output (Negative polarity)
BZ output (Positive polarity)
Fig. 4.12.6.1 Timing chart for one-shot output
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