mc68hc08qa24 Freescale Semiconductor, Inc, mc68hc08qa24 Datasheet - Page 362

• Manufacturer Part Number: mc68hc08qa24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

CAN Controller
22.13.2 Identifier Registers
Technical Data
360
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 highest priority of an identifier is defined as the smallest binary
number.
SRR — Substitute Remote Request Bit
IDE — ID Extended Flag
RTR — Remote Transmission Request Flag
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 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 case of a transmit buffer, the flag indicates to the
MSCAN08 what type of identifier to send.
This flag reflects the status of the remote transmission request bit in
the CAN frame. In case of a receive buffer, it indicates the status of
the received frame and allows the transmission of an answering
frame in software to be supported. In case of a transmit buffer, this
flag defines the setting of the RTR bit to be sent.
1 = Extended format, 29 bits
0 = Standard format, 11 bits
1 = Remote frame
0 = Data frame
CAN Controller
Freescale Semiconductor
MC68HC08QA24