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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： | 7/41页 |
| 文件大小： | 324K |
| 代理商： | YMF721-S |
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YMF721
July 10, 1997
- 15 -
6-2. Command/Response register
I/O port for power down and suspend/resume register is described here.
Command/Response Port (R/W):
port
D7
D6D5D4D3D2D1D0
OPL_Base + 6
Command Write
OPL_Base + 6
Response Read
Command Write...
An interrupt occurs when data has been written into this register.
Response Read...
Response to a command is read from this register.
Note :
For the details of Command/Response, refer to 6-3.
6-3. Details of command register
Some of commands supported in the command register are as follows.
6-3-1. Suspend information
Command and response have the following formats.
Checksum is determined so that lower eight bits of the sum of values from length L to checksum
becomes "0".
The state of internal processor immediately before execution of this command can be resumed by
writing the data that is read into the internal processor by using resume command described below.
Command
Sub Command Command Length Response Length
Function
E0h
-
1 byte
variable
Reading suspend information
E1h
00h
variable
-
Resume
FDh
-
1 byte
-
Moving into power down mode
FEh
-
1 byte
-
Checking operating conditions
FFh
-
1 byte
-
Discontinuing command execution
Command
Response
E0h
Command byte
FFh
Response 1st byte
length L
data length (lower 8bit)
length H
data length (upper 8bit)
data_0
data
...........
.......
data_n
last data
checksum
checksum (8 bit)
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