
MSCAN08 Controller (MSCAN08)
Programmer’s Model of Message Storage
MC68HC08AZ32A — Rev 1.0
Technical Data
MOTOROLA
MSCAN08 Controller (MSCAN08)
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20.13.1 Message Buffer Outline
Figure 20-11
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 20-12
. All bits of the
13-byte data structure are undefined out of reset.
NOTE:
The foreground receive buffer can be read anytime but cannot be
written. The transmit buffers can be read or written anytime.
Addr
(1)
$05b0
$05b1
$05b2
$05b3
$05b4
$05b5
$05b6
$05b7
$05b8
$05b9
$05bA
$05bB
$05bC
Register Name
IDENTIFIER REGISTER 0
IDENTIFIER REGISTER 1
IDENTIFIER REGISTER 2
IDENTIFIER REGISTER 3
DATA SEGMENT REGISTER 0
DATA SEGMENT REGISTER 1
DATA SEGMENT REGISTER 2
DATA SEGMENT REGISTER 3
DATA SEGMENT REGISTER 4
DATA SEGMENT REGISTER 5
DATA SEGMENT REGISTER 6
DATA SEGMENT REGISTER 7
DATA LENGTH REGISTER
TRANSMIT BUFFER PRIORITY
REGISTER
(2)
UNUSED
UNUSED
$05bD
$05bE
$05bF
1. Where b equals the following:
b=4 for Receive Buffer
b=5 for Transmit Buffer 0
b=6 for Transmit Buffer 1
b=7 for Transmit Buffer 2
2. Not applicable for receive buffers
Figure 20-10. Message Buffer Organization
F
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n
.