Datasheet

MSCAN Controller
Programmer’s Model of Message Storage
MC68HC912DT128A — Rev 4.0 Technical Data
MOTOROLA MSCAN Controller 347
18.12.1 Message Buffer Outline
Figure 18-12 shows the common 13 byte data structure of receive and
transmit buffers for extended identifiers. The mapping of standard
identifiers into the IDR registers is shown in Figure 18-13. All bits of the
13 byte data structure are undefined out of reset.
NOTE: The foreground receive buffer can be read anytime but can not be
written. The transmit buffers can be read or written anytime.
Figure 18-12. Receive/Transmit Message Buffer Extended Identifier
ADDR
(1)
REGISTERR/WBIT 7654321BIT 0
$01x0
IDR0
R
ID28 ID27 ID26 ID25 ID24 ID23 ID22 ID21
W
$01x1
IDR1
R
ID20 ID19 ID18 SRR (1) IDE (1) ID17 ID16 ID15
W
$01x2
IDR2
R
ID14 ID13 ID12 ID11 ID10 ID9 ID8 ID7
W
$01x3
IDR3
R
ID6 ID5 ID4 ID3 ID2 ID1 ID0 RTR
W
$01x4 DSR0
R
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
W
$01x5 DSR1
R
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
W
$01x6 DSR2
R
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
W
$01x7 DSR3
R
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
W
$01x8 DSR4
R
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
W
$01x9 DSR5
R
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
W
$01xA DSR6
R
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
W
$01xB DSR7
R
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
W
$01xC DLR
R
DLC3 DLC2 DLC1 DLC0
W
1. x is 4, 5, 6, or 7 depending on which buffer RxFG, Tx0, Tx1, or Tx2 respectively.
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
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