參數(shù)資料
型號(hào)： ML9620GAZ210
廠商： OKI ELECTRIC INDUSTRY CO LTD
元件分類： 微控制器/微處理器
英文描述： 1 CHANNEL(S), 1M bps, LOCAL AREA NETWORK CONTROLLER, PQFP44
封裝： 0.80 MM PITCH, PLASTIC, QFP-44
文件頁數(shù)： 41/79頁
文件大小： 449K
代理商： ML9620GAZ210
ML9620 User’s Manual
Chapter 3
Operational Description
3 - 6
3.5
Updating a Transmit Object
The MCU may update the data bytes of a Transmit Object any time via the IFm Interface registers, neither
MsgVal nor TxRqst have to be reset before the update.
Even if only a part of the data bytes are to be updated, all four bytes of the corresponding IFm Data A Register or
IFm Data B Register have to be valid before the content of that register is transferred to the Message Object.
Either the MCU has to write all four bytes into the IFm Data Register or the Message Object is transferred to the
IFm Data Register before the MCU writes the new data bytes.
When only the (eight) data bytes are updated, first 0x87 is written to the Command Mask Register and then the
number of the Message Object is written to the Command Request Register, concurrently updating the data bytes
and setting TxRqst.
To prevent the reset of TxRqst at the end of a transmission that may already be in progress while the data is
updated, NewDat has to be set together with TxRqst. For details see section section 3.3.2.
When NewDat is set together with TxRqst, NewDat will be reset as soon as the new transmission has started.
Configuration Transmit
END
Busy=0 ?
Write to
IFm Commad Mask register
(WR=1, TxRqst=1
Other bits are optional)
see Captor 2.3.3.1
Write Message Number to
IFm Command Request register
No
Yes
Set to
Message Object registers
see Captor 2.3.5
Figure 3-2 Procidure Updating a Transmit Object
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