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| 型號： | MSM9225BGA-2K |
| 廠商： | OKI ELECTRIC INDUSTRY CO LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 2 CHANNEL(S), 1M bps, LOCAL AREA NETWORK CONTROLLER, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數(shù)： | 25/95頁 |
| 文件大?。?/td> | 567K |
| 代理商： | MSM9225BGA-2K |
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MSM9225B User’s Manual
Chapter 2 Register Descriptions
2 – 18
2.4.1 CAN Control Register (CANC: 0Ehex)
This register controls the operation of CAN.
The bit configuration is as follows:
MSB
Not
used
RxF
TxF
CANA
Not
used
Not
used
TIRS
INIT
LSB
CANC (0Ehex), *R/W: R/W
Initial
value:
00
01
0
Release initialization mode
1
Set initialization mode
0
Terminate search of transmission
message boxes
1
Search transmission message boxes
Unused bit
Write a “0”.
0
No writing is being done to the message
boxes
1
Now writing receive data to the message
boxes
0
Transmission operation halted
1
Transmission operation is in progress
0
Receive operation halted
1
Receive operation is in progress
Unused bit
Write a “0”.
* TIRS is in the read-only state when “0”, and CANA, TxF, RxF are read-only bits.
Figure 2-18 CAN Control Register (CANC)
(1) Initialization bit: INIT
This is the bit for setting the initialization mode of the communication control section.
At the time of initialization, start the initialization after writing a “1” to INIT and reading it to ensure that
INIT has been set to “1”. Also, at the end of initialization, write a “0” to INIT, then read this bit to make
sure that it has been set to “0”. In either case, make sure to carry out the above operations because neither
“1” nor “0” will be set immediately. Note that data cannot be written to the INIT bit while the CAN bus is
at the dominant level.
If INIT is set to “1” during transmission or reception, the initialization is started after completing the
communication. Although the communication operation stops when INIT is set to “1”, the contents of the
message memory and the control registers will be retained, except the content of the MMA bit of the
message control register within the message box.
To initialize the message memory, first write the number of message boxes to be used in the message box
count setting register NMES, and then write the message control register, identifier 1, and identifier 2 in
sequence from the message box number 0 for all the message boxes to be used.
At reset, INIT is set to “1”.
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