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参数资料
| 型号： | YMF721-S |
| 元件分类： | 音频合成 |
| 英文描述： | SPEECH SYNTHESIZER, PQFP100 |
| 封装： | SQFP-100 |
| 文件页数： | 8/41页 |
| 文件大小： | 324K |
| 代理商： | YMF721-S |
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YMF721
July 10, 1997
- 16 -
6-3-2. Resume
Command and Response have the following formats.
For Resume, data following the sub command are transmitted as seven bit data. Thus, it is necessary
to send the data obtained with suspend command to the internal processor after encoding it.
Checksum is determined so that the result of logical product (AND) of 7Fh and the sum of sub
command byte, encoded data and checksum becomes "0". The internal processor returns to the state
immediately before execution of Command E0h when it confirms that the data has been received
normally.
6-3-3. Others
YMF721(OPL4-ML2) can use the following special commands that do not send response.
1) Command FDh : Power down mode
Refer to 5-1.
When the power down command FDh has been written into the command register, do not write
any command before the return command to the control register has been executed.
2) Command FEh : Checking operating state of internal processor
This command is used to check if the internal processor is operating normally.
The internal processor is deemed operating normally if GBUSY bit of Status register is "0".
3) Command FFh : Discontinuing command execution
This command is used to discontinue the execution of a command. This command can be used
only when another command is being executed.
Command
Response
E1h
Command byte
None
0x00
Sub Command
data_0
data
..........
.......
data_n
last data
checksum
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| YMF724F-V | 制造商:YAMAHA 制造商全称:YAMAHA CORPORATION 功能描述:high performance audio controller for the PCI Bus |
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