Freescale Semiconductor, Inc.
MSCAN Controller
Programmer’s Model of Message Storage
Figure 17-10. Message Buffer Organization
(1)
Register name
Address
01x0
01x1
01x2
01x3
01x4
01x5
01x6
01x7
01x8
01x9
01xA
01xB
01xC
01xD
01xE
01xF
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
(2)
Transmit buffer priority register
Unused
Unused
1. x is 4, 5, 6, or 7 depending on which buffer RxFG,
Tx0, Tx1, or Tx2 respectively.
2. Not applicable for receive buffers
17.12.1 Message Buffer Outline
Figure 17-11 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 17-12. 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.
68HC(9)12D60 — Rev 4.0
MOTOROLA
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MSCAN Controller
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