Philips LPC2129 - Table 137: CAN Tx Frame Information Register (CANTFI1, 2, 3 - 0 Xe00 X X030, 40, 50); Table 138: CAN Tx Identifier Register When FF=0 (CANTID1, 2, 3 - 0 Xe00 X X034, 44, 54); Table 139: CAN Tx Identifier Register When FF=1 (CANTID1, 2, 3

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CAN Controllers and Acceptance Filter 201 May 03, 2004

Philips Semiconductors Preliminary User Manual

LPC2119/2129/2292/2294ARM-based Microcontroller

Tx Frame Information Register (CANTFI1, 2, 3 - 0xE00x x030, 40, 50)

When the corresponding TBS bit in CANSR is 1, software can write to one of these registers to define the format of the next

transmit message for that Tx buffer. Bits not listed read as 0 and should be written as 0. See Table 124 for details on specific

CAN channel register address.

Tx Identifier Register (CANTID1, 2, 3 - 0xE00x x034, 44, 54)

When the corresponding TBS bit in CANSR is 1, software can write to one of these registers to define the Identifier field of the

next transmit message. Bits not listed read as 0 and should be written as 0. The register assumes two different formats

depending on the FF bit in CANTFI. See Table 124 for details on specific CAN channel register address.

Table 138: CAN Tx Frame Information Register (CANTFI1, 2, 3 - 0xE00x x030, 40, 50)

CANTFI Name Function Reset Value RM Set

7:0 PRIO

If the TPM bit in the CANMOD register is 1, enabled Tx Buffers contend for the right

to send their messages based on this field. The lowest binary value has priority.

19:16 DLC

This value is sent in the DLC field of the next transmit message. In addition, if RTR=0,

this value controls the number of Data bytes sent in the next transmit message, from

the CANTDA and CANTDB registers:

0000-0111 = 0-7 bytes 1xxx = 8 bytes

30 RTR

This value is sent in the RTR bit of the next transmit message. If this bit is 0, the

number of data bytes called out by the DLC field are sent from the CANTDA and

CANTDB registers. If it’s 1, a Remote Frame is sent, containing a request for that

number of bytes.

31 FF

If this bit is 0, the next transmit message will be sent with an 11-bit Identifier, while if

it’s 1, the message will be sent with a 29-bit Identifier.

Table 139: CAN Tx Identifier Register when FF=0 (CANTID1, 2, 3 - 0xE00x x034, 44, 54)

CANTID Name Function Reset Value RM Set

10:0 ID The 11-bit Identifier to be sent in the next transmit message. 0 X

Table 140: CAN Tx Identifier Register when FF=1 (CANTID1, 2, 3 - 0xE00x x034, 44, 54)

CANTID Name Function Reset Value RM Set

28:0 ID The 29-bit Identifier to be sent in the next transmit message. 0 X

Philips LPC2129 - Table 137: CAN Tx Frame Information Register (CANTFI1, 2, 3 - 0 Xe00 X X030, 40, 50); Table 138: CAN Tx Identifier Register When FF=0 (CANTID1, 2, 3 - 0 Xe00 X X034, 44, 54); Table 139: CAN Tx Identifier Register When FF=1 (CANTID1, 2, 3 - 0 Xe00 X X034, 44, 54)