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參數(shù)資料
| 型號： | UPD6708CX |
| 廠商： | NEC Corp. |
| 英文描述： | IEBusa Inter Equipment Busa PROTOCOL CONTROL LSI |
| 中文描述： | IEBusa設備布薩間協(xié)議控制大規(guī)模集成電路 |
| 文件頁數(shù)： | 18/72頁 |
| 文件大?。?/td> | 292K |
| 代理商： | UPD6708CX |
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18
μ
PD6708
(2)
Transferring data command (control bit: read (3H, 7H), write (AH, BH, EH, FH))
During data read (3H, 7H), the data in the data buffer of the slave unit are read to the master unit.
During data write (BH, FH) or during command write (AH, EH), the data the slave unit has received are processed
according to the operation convention.
Remarks
1.
2.
The user can voluntarily select data and command as his system requires.
Control bits 3H, AH, and BH may be locked depending on the communication condition and status.
(3)
Reading lock address (control bits: 4H, 5H)
When the lock address is read processing (4H, 5H), the address (12 bits) of the master unit that has issued the lock
instruction is read in 1-byte units, as shown below.
Figure 2-3. Lock Address Configuration
(4)
Locking and unlocking (locking (3H, AH, BH), unlocking (6H))
The lock function is used to transfer a message over two or more frames.
A locked unit receives data only from the unit that has locked the unit.
Locking and unlocking are performed as described below.
<1> Locking
After the transmission/reception of the acknowledge bit ‘0’ of the message length field by the control bits (3H, AH,
BH) which specify the lock has ended, if the communication frame is completed without completing the transmission or
reception of the number of data bytes specified by the message length bits, the slave unit is locked by the master unit.
At this time, the bit (bit 2) relating to the locking of the byte which indicates the slave status is set to ‘1’.
<2> Unlocking
After completion of transmission or reception of data in one frame by the number of data bytes specified by the message
length bits with control bits (3H, AH, or BH) specifying locking or control bits (6H) specifying unlocking, the slave unit
is unlocked by the master unit. At this time, the bit (bit 2) relating to the locking of the byte which indicates the slave
status is reset to ‘0’.
Locking and unlocking are not performed in the case of broadcast communication.
Caution
To unlock the unit specified to be unlocked by the unit itself, the INIT command (see 5.2.1 “INIT
command”) must be executed with the
μ
PD6708 (Whether a unit is locked or not can be checked by using
the GETSA command (see 5.2.7 “GETSA command”).
#
MSB
LSB
Lower 8 Bits
Undefined
Higher 4 Bits
Control Bits : 4H
Control Bits : 5H
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相關代理商/技術參數(shù) |
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|---|---|
| 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 |
| UPD67240 | 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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