MC912DG128ACPVE Datasheet, PDF (347/478 Pages) Freescale Semiconductor, Inc – Upward compatible with M68HC11 instruction set

Freescale Semiconductor, Inc.
MSCAN Controller
Programmer’s Model of Message Storage
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⁾
$01x0
$01x1
$01x2
$01x3
$01x4
$01x5
$01x6
$01x7
$01x8
$01x9
$01xA
$01xB
$01xC
REGISTER
IDR0
IDR1
IDR2
IDR3
DSR0
DSR1
DSR2
DSR3
DSR4
DSR5
DSR6
DSR7
DLR
R/W BIT 7
R
ID28
W
R
ID20
W
R
ID14
W
R
ID6
W
R
DB7
W
R
DB7
W
R
DB7
W
R
DB7
W
R
DB7
W
R
DB7
W
R
DB7
W
R
DB7
W
R
W
6
ID27
ID19
ID13
ID5
DB6
DB6
DB6
DB6
DB6
DB6
DB6
DB6
5
ID26
4
ID25
3
ID24
2
ID23
1
ID22
ID18 SRR (1) IDE (1) ID17 ID16
ID12 ID11 ID10 ID9
ID8
ID4
ID3
ID2
ID1
ID0
DB5 DB4 DB3 DB2 DB1
DB5 DB4 DB3 DB2 DB1
DB5 DB4 DB3 DB2 DB1
DB5 DB4 DB3 DB2 DB1
DB5 DB4 DB3 DB2 DB1
DB5 DB4 DB3 DB2 DB1
DB5 DB4 DB3 DB2 DB1
DB5 DB4 DB3 DB2 DB1
DLC3 DLC2 DLC1
1. x is 4, 5, 6, or 7 depending on which buffer RxFG, Tx0, Tx1, or Tx2 respectively.
BIT 0
ID21
ID15
ID7
RTR
DB0
DB0
DB0
DB0
DB0
DB0
DB0
DB0
DLC0
MC68HC912DT128A — Rev 4.0
MOTOROLA
MSCAN Controller
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Technical Data
347