MC68HC05X16 Datasheet, PDF (82/232 Pages) Freescale Semiconductor, Inc – High-density complementary metal oxide semiconductor HCMOS) microcontroller unit

Freescale Semiconductor, Inc.
5.3.10 Transmit buffer identifier register (TBI)
Transmit buffer identifier (TBI)
Address bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
$002A ID10 ID9 ID8 ID7 ID6 ID5 ID4 ID3 Undefined
ID10 – ID3 — Identifier bits
The identifier consists of 11 bits (ID10 – ID0). ID10 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. The three least significant bits are contained in the TRTDL register.
5
The seven most significant bits must not all be recessive.
5.3.11 Remote transmission request and data length code
register (TRTDL)
Address bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
RTR and data length code (TRTDL) $002B ID2 ID1 ID0 RTR DLC3 DLC2 DLC1 DLC0 Undefined
ID2 – ID0 — Identifier bits
These bits contain the least significant bits of the transmit buffer identifier.
RTR — Remote transmission request
1 (set) – A remote frame will be transmitted.
0 (clear) – A data frame will be transmitted.
DLC3 – DLC0 — Data length code bits.
The data length code contains the number of bytes (data byte count) of the respective message.
At transmission of a remote frame, the data length code is ignored, forcing the number of bytes to
be 0. The data byte count ranges from 0 to 8 for a data frame. Table 5-6 shows the effect of setting
the DLC bits.
MOTOROLA CAN MODULE (MCAN)
MC68HC05X16
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Rev. 1
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