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參數(shù)資料
| 型號： | UPD6708 |
| 廠商： | NEC Corp. |
| 英文描述： | IEBusa Inter Equipment Busa PROTOCOL CONTROL LSI |
| 中文描述： | IEBusa設(shè)備布薩間協(xié)議控制大規(guī)模集成電路 |
| 文件頁數(shù)： | 34/72頁 |
| 文件大小： | 292K |
| 代理商： | UPD6708 |
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34
μ
PD6708
5.2.4
MREQ2 command (command code: 0011)
(1)
Functions
This command re-executes a master communication (transmission or reception). If master transmission or reception
stops midway, the master communication is re-executed from the stopped condition.
(2)
Command execution conditions
If a communication control command other than an MREQ2 command is executed after the master communication ends
midway, the MREQ1 command may not re-execute the communication correctly from the communication interrupted
condition.
(3)
Example
When re-execution is performed by the MREQ2 command when communication has been interrupted due to generation
of a timing error after transmission of two bytes (12H and 34H) in mode 1, as in the MREQ1 command example, the contents
of WDB and CMR are as shown below.
The previously set MREQ1 command values are used for the broadcast bits, control bits and number of transmit data
bytes.
Cautions
1. A master communication performed by execution of the MREQ1 and MREQ2 commands is performed
in only one frame. However, if the unit loses in arbitration, the frame is automatically reset up twice
(three times in total).
2. INIT command must be executed before setting the MREQ1 or MREQ2 command. If MREQ1 or MREQ2
is set before execution of INIT command, master communication will not be performed.
5.2.5
ABORT command (command code: 0100)
(1)
Functions
This command aborts master communications and slave unit data transmissions.
<1>
It clears the data placed in WDB.
<2>
It cancels the slave transmit data (SETSD command).
(2)
Example
When the master unit begins communication as in the MREQ1 command example, a communication error is generated
and the two bytes of transmit data (12H and 34H) remaining in WDB are canceled by ABORT command, the contents of
CMR are as shown below.
0101
0110
0111
1000
0100
0011
First Byte
Second Byte
Data to be Transmitted upon
Re-Execution of Command
Third Byte
Fourth Byte
WDB
CMR
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPD6708CX | 制造商:NEC 制造商全稱:NEC 功能描述:IEBusa Inter Equipment Busa PROTOCOL CONTROL LSI |
| UPD6708GS | 制造商:NEC 制造商全稱:NEC 功能描述:IEBusa Inter Equipment Busa PROTOCOL CONTROL LSI |
| UPD6708GS(A) | 制造商:Renesas Electronics Corporation 功能描述: |
| UPD67100 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ASIC |
| UPD67101 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ASIC |
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