參數(shù)資料
型號(hào): CR16HCS9VJE7Y
英文描述: Microcontroller
中文描述: 微控制器
文件頁數(shù): 107/157頁
文件大小: 1256K
代理商: CR16HCS9VJE7Y
107
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20.9.5
Storage of Messages with Less Than 8 Data
Bytes
The data bytes that are not used for data transfer are “don’t
cares”. If the object is transmitted, the data within these bytes
will be ignored. If the object is received, the data within these
bytes will be overwritten with invalid data.
20.9.6
If the IDE bit is set to “1”, the buffer handles extended frames.
The storage of the extended ID follows the descriptions in
Table 29. The SRR bit is at the bit position of the RTR bit for
standard frame and needs to be transmitted as “1”.
Storage of Extended Messages
SRR
Substitute Remote Request. SRR replaces the
RTR bit used in standard frames at this bit po-
sition. The SRR bit needs to be set to “1” by the
user if the buffer is configured to transmit a
message with an extended identifier. It will be
received as monitored on the CAN bus.
Identifier Extension. IDE is set to “0” to indicate
that the message is a standard frame using 11
identifier bits. If IDE is set to “1”, the object
stored in the buffer is handled as an extended
frame.
Remote Transmission Request. RTR is set to
“1” to indicate that the message is a remote
frame. For a data frame, the RTR bit is set to
“0”.
The ID bits 28 to 0 are used to build the 29-bit
identifier of an extended frame.
IDE
RTR
ID[28:0]
Table 29
Extended Messages with 8 Data Bytes
ADDR
BUFFER
register
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
xxxE
16
ID1
ID28
ID27
ID26
ID25
ID24
ID23
ID22
ID21
ID20
ID19
ID18
SRR
IDE
ID17
ID16
ID15
xxxC
16
ID0
ID14
ID13
ID12
ID11
ID10
ID9
ID8
ID7
ID6
ID5
ID4
ID3
ID2
ID1
ID0
RTR
xxxA
16
DATA0
Data
1.7
Data
1.6
Data
1.5
Data
1.4
Data
1.3
Data
1.2
Data
1.1
Data
1.0
Data
2.7
Data
2.6
Data
2.5
Data
2.4
Data
2.3
Data
2.2
Data
2.1
Data
2.0
xxx8
16
DATA1
Data
3.7
Data
3.6
Data
3.5
Data
3.4
Data
3.3
Data
3.2
Data
3.1
Data
3.0
Data
4.7
Data
4.6
Data
4.5
Data
4.4
Data
4.3
Data
4.2
Data
4.1
Data
4.0
xxx6
16
DATA2
Data
5.7
Data
5.6
Data
5.5
Data
5.4
Data
5.3
Data
5.2
Data
5.1
Data
5.0
Data
6.7
Data
6.6
Data
6.5
Data
6.4
Data
6.3
Data
6.2
Data
6.1
Data
6.0
xxx4
16
DATA3
Data
7.7
Data
7.6
Data
7.5
Data
7.4
Data
7.3
Data
7.2
Data
7.1
Data
7.0
Data
8.7
Data
8.6
Data
8.5
Data
8.4
Data
8.3
Data
8.2
Data
8.1
Data
8.0
xxx2
16
TSTP
TSTP
15
TSTP
14
TSTP
13
TSTP
12
TSTP
11
TSTP
10
TSTP
9
TSTP
8
TSTP
7
TSTP
6
TSTP
5
TSTP
4
TSTP
3
TSTP
2
TSTP
1
TSTP
0
xxx0
16
CNTSTAT
DLC3
DLC2
DLC1
DLC0
Reserved
PRI3
PRI2
PRI1
PRI0
ST3
ST2
ST1
ST0
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