mc68hc912dg128 Freescale Semiconductor, Inc, mc68hc912dg128 Datasheet - Page 335

• Manufacturer Part Number: mc68hc912dg128
• Description: M68hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

17.12.2 Identifier Registers (IDRn)
MC68HC912DG128 — Rev 3.0
MOTOROLA
ADDR
1. x is 4, 5, 6, or 7 depending on which buffer RxFG, Tx0, Tx1, or Tx2 respectively.
$01x0
$01x1
$01x2
$01x3
(1)
REGISTER
IDR0
IDR1
IDR2
IDR3
The identifiers consist of either 11 bits (ID10–ID0) for the standard, or 29
bits (ID28–ID0) for the extended format. ID10/28 is the most significant
bit and is transmitted first on the bus during the arbitration procedure.
The priority of an identifier is defined to be highest for the smallest binary
number.
SRR — Substitute Remote Request
IDE — ID Extended
Figure 17-13. Standard Identifier Mapping
Freescale Semiconductor, Inc.
This fixed recessive bit is used only in extended format. It must be set
to 1 by the user for transmission buffers and will be stored as received
on the CAN bus for receive buffers.
This flag indicates whether the extended or standard identifier format
is applied in this buffer. In the case of a receive buffer the flag is set
as being received and indicates to the CPU how to process the buffer
identifier registers. In the case of a transmit buffer the flag indicates to
the msCAN12 what type of identifier to send.
R/W
W
W
W
W
R
R
R
R
For More Information On This Product,
0 = Standard format (11-bit)
1 = Extended format (29-bit)
BIT 7
ID10
ID2
Go to: www.freescale.com
MSCAN Controller
ID9
ID1
6
ID8
ID0
5
RTR
ID7
4
Programmer’s Model of Message Storage
IDE(0)
ID6
3
ID5
2
MSCAN Controller
ID4
Technical Data
1
BIT 0
ID3
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