![NXP Semiconductors LPC43Sxx Скачать руководство пользователя страница 1260](http://html1.mh-extra.com/html/nxp-semiconductors/lpc43sxx/lpc43sxx_user-manual_17218271260.webp)
UM10503
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
1260 of 1441
NXP Semiconductors
UM10503
Chapter 45: LPC43xx/LPC43Sxx C_CAN
45.6.3 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.
45.6.3.1 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.
45.6.3.2 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 1068.CAN message interface data B2 registers (IF2_DB2, address 0x400E 20A8
(C_CAN0) and 0x400A 40A8 (C_CAN1)) 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 1069.CAN transmission request 1 register (TXREQ1, address 0x400E 2100 (C_CAN0)
and 0x400A 4100 (C_CAN1)) 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
-
-
Table 1070.CAN transmission request 2 register (TXREQ2, address 0x400E 2104 (C_CAN0)
and 0x400A 4104 (C_CAN1)) bit description
Bit
Symbol
Description
Reset
value
Access
15:0
TXRQST32_17
Transmission request bit of message objects 32 to 17.
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
-
-