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| 型號(hào)： | CR16HCT9 |
| 文件頁(yè)數(shù)： | 108/157頁(yè) |
| 文件大小： | 1256K |
| 代理商： | CR16HCT9 |
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108
20.9.7
During remote frame transfer, the buffer registers DATA[3:0]
are “don’t cares”. If a remote frame is transmitted, the con-
tents of these registers are ignored. If a remote frame is re-
Storage of Remote Messages
ceived, the contents of these registers will be overwritten with
invalid data. The structure of a message buffer set up for a
remote frame with extended identifier is shown in Table 30.
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.
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. The ID1 buffer
bits ID28 to ID18 are used for the 11 standard
frame identifier bits.
IDE
RTR
ID[28:0]
20.9.8
The CAN Global Configuration Register (CGCR) is a 16-bit
wide register used to:
enable/disable the CR16CAN
configure the BUFFLOCK function for the message buffer
0...14
enable/disable the time stamp synchronization
set the logic levels of the CAN Input/Output pins
CANRX/CANTX
choose the data storage direction (DDIR)
select the error interrupt type (EIT)
enable/disable diagnostic functions
15
12
11
10
Reserved
EIT DIAGEN INTERNAL LOOPBACK
0
r/w
CAN Global Configuration Register (CGCR)
CANEN
CAN Enable. This bit enables/disables the
CR16CAN. When the CR16CAN is disabled,
all internal states and the TEC and REC
counter registers are cleared. In addition the
CR16CAN clock is disabled. All CR16CAN
control registers and the contents of the object
memory are left unchanged.
The user needs to make sure that no message
is pending for transmission before the
CR16CAN is disabled.
“0”
CR16CAN is disabled
“1”
CR16CAN is enabled
Control Transmit. This bit configures the logic
level of the CAN transmit pin CANTX.
CTX
Table 30
Extended Remote Frame
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
don’t care
xxx8
16
DATA1
don’t care
xxx6
16
DATA2
don’t care
xxx4
16
DATA3
don’t care
xxx2
16
TSTP
TSTP15
TSTP14
TSTP13
TSTP12
TSTP11
TSTP10
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
9
8
7
6
L
O
5
4
3
2
1
0
IGNAC
K
DDI
R
TSTPE
N
BUFFLOC
K
0
r/w
CR
X
CT
X
CANE
N
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