MC68HC908AT32 Datasheet, PDF (265/378 Pages) Freescale Semiconductor, Inc – Microcontrollers

Programmer’s Model of Message Storage
23.12.1 Message Buffer Outline
Figure 23-10 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 23-11. All bits of
the 13-byte data structure are undefined out of reset.
Addr.
$05b0
$05b1
$05b2
$05b3
$05b4
$05b5
$05b6
$05b7
$05b8
$05b9
$05bA
$05bB
$05bC
Register
IDR0
Bit 7
6
5
4
3
2
1
Read:
ID28
ID27
ID26
ID25
ID24
ID23
ID22
Write:
Read:
IDR1
ID20
ID19
ID18
SRR (1) IDE (1)
ID17
ID16
Write:
Read:
IDR2
ID14
ID13
ID12
ID11
ID10
ID9
ID8
Write:
Read:
IDR3
ID6
ID5
ID4
ID3
ID2
ID1
ID0
Write:
DSR0
Read:
DB7
DB6
DB5
DB4
DB3
DB2
DB1
Write:
DSR1
Read:
DB7
DB6
DB5
DB4
DB3
DB2
DB1
Write:
DSR2
Read:
DB7
DB6
DB5
DB4
DB3
DB2
DB1
Write:
DSR3
Read:
DB7
DB6
DB5
DB4
DB3
DB2
DB1
Write:
DSR4
Read:
DB7
DB6
DB5
DB4
DB3
DB2
DB1
Write:
DSR5
Read:
DB7
DB6
DB5
DB4
DB3
DB2
DB1
Write:
DSR6
Read:
DB7
DB6
DB5
DB4
DB3
DB2
DB1
Write:
DSR7
Read:
DB7
DB6
DB5
DB4
DB3
DB2
DB1
Write:
Read:
DLR
Write:
DLC3
DLC2
DLC1
= Unimplemented
Figure 23-10. Receive/Transmit Message Buffer Extended Identifier (IDRn)
Bit 0
ID21
ID15
ID7
RTR
DB0
DB0
DB0
DB0
DB0
DB0
DB0
DB0
DLC0
MC68HC908AT32 Data Sheet, Rev. 3.1
Freescale Semiconductor
265