參數(shù)資料
型號(hào): MSM9225BGA-2K
廠商: OKI ELECTRIC INDUSTRY CO LTD
元件分類(lèi): 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(yè)數(shù): 29/95頁(yè)
文件大?。?/td> 567K
代理商: MSM9225BGA-2K
MSM9225B User’s Manual
Chapter 2
Register Descriptions
2 – 22
2.4.3 Message Box Count Setting Register (NMES: 1Ehex)
This is a register to set the number of message boxes to be used.
A maximum of 16 message boxes can be set, with message box numbers 0 to F.
Writing to NMES is enabled when initialize bit INIT of the CAN control register (CANC: 0Ehex) is “1”.
At reset, NMES is set to “00000000”
The bit configuration and relationship between message box number and number of message boxes are as
follows:
MSB
Not
used
Not
used
Not
used
Not
used
NMES3 NMES2 NMES1 NMES0
LSB
NMES (1Ehex), *R/W: R/W
Initial
value:
0
NMES3 NMES2 NMES1 NMES0
Number of message boxes
0
Not used
0
1
Not used
0
1
0
3 (message boxes 0-2)
1
0
15 (message boxes 0–E)
1
16 (message boxes 0–F)
Unused bit.
Write a “0”.
Figure 2-21
Message Box Count Setting Register (NMES)
Notes on how to set the NMES register
Number of message boxes must use three message boxes. This three message boxes not use group message
function.
Message box number
Message box
0
1
2
*Not use group message function.
(a) When 3 message boxes are used.
Message box number
Message box
0
1
2
3
GM0 or GM1
*Can use group message function for only one message box
(b) When 4 message boxes are used.
Message box number
Message box
0
1
2
3
GM0 or GM1
4
GM1 or GM0
(c) When 5 message boxes are used.
Figure2-22 Message box setting example.
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