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UM10398 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2014. All rights reserved.
User manual Rev. 12.3 — 10 June 2014 301 of 547
NXP Semiconductors
UM10398
Chapter 16: LPC111x/LPC11Cxx C_CAN controller
16.6.2.4.8 CAN message interface data B1 registers
16.6.2.4.9 CAN message interface data B2 registers
16.6.3 Message handler registers
All Message Handler registers are read-only. Their contents (TXRQST, NEWDAT,
INTPND, and MSGVAL bits of each Message Object and the Interrupt Identifier) is status
information provided by the Message Handler FSM.
16.6.3.1 CAN transmission request 1 register
This register contains the TXRQST bits of message objects 1 to 16. By reading out the
TXRQST bits, the CPU can check for which Message Object a Transmission Request is
pending. The TXRQST bit of a specific Message Object can be set/reset by the CPU via
the IFx Message Interface Registers or by the Message Handler after reception of a
Remote Frame or after a successful transmission.
16.6.3.2 CAN transmission request 2 register
This register contains the TXRQST bits of message objects 32 to 17. By reading out the
TXRQST bits, the CPU can check for which Message Object a Transmission Request is
pending. The TXRQST bit of a specific Message Object can be set/reset by the CPU via
the IFx Message Interface Registers or by the Message Handler after reception of a
Remote Frame or after a successful transmission.
Table 265. CAN message interface data B1 registers (CANIF1_DB1, address 0x4005 0044
and CANIF2_DB1, address 0x4005 00A4) bit description
Bit Symbol Description Reset value Access
7:0 DATA4 Data byte 4 0x00 R/W
15:8 DATA5 Data byte 5 0x00 R/W
31:16 - Reserved - -
Table 266. CAN message interface data B2 registers (CANIF1_DB2, address 0x4005 0048
and CANIF2_DB2, address 0x4005 00A8) bit description
Bit Symbol Description Reset value Access
7:0 DATA6 Data byte 6 0x00 R/W
15:8 DATA7 Data byte 7 0x00 R/W
31:16 - Reserved - -
Table 267. CAN transmission request 1 register (CANTXREQ1, address 0x4005 0100) bit
description
Bit Symbol Description Reset
value
Access
15:0 TXRQST16_1 Transmission request bit of message objects 16 to 1.
0 = This message object is not waiting for
transmission.
1 = The transmission of this message object is
requested and not yet done.
0x00 R
31:16 - Reserved - -