UM10360 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
User manual Rev. 3 — 19 December 2013 367 of 841
NXP Semiconductors
UM10360
Chapter 16: LPC176x/5x CAN1/2
16.7.11 CAN Receive Data register A (CAN1RDA - 0x4004 4028, CAN2RDA -
0x4004 8028)
This register contains the first 1-4 Data bytes of the current received message. It is
read-only in normal operation, but can be written for testing purposes if the RM bit in
CANMOD is 1. See Table 313
for details on specific CAN channel register address.
16.7.12 CAN Receive Data register B (CAN1RDB - 0x4004 402C, CAN2RDB -
0x4004 802C)
This register contains the 5th through 8th Data bytes of the current received message. It is
read-only in normal operation, but can be written for testing purposes if the RM bit in
CANMOD is 1. See Table 313
for details on specific CAN channel register address.
16.7.13 CAN Transmit Frame Information register (CAN1TFI[1/2/3] -
0x4004 40[30/ 40/50], CAN2TFI[1/2/3] - 0x4004 80[30/40/50])
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.
Table 327. RX Identifier register when FF = 1
Bit Symbol Function Reset Value RM Set
28:0 ID The 29-bit Identifier field of the current received message. In CAN 2.0B these bits
are called ID29-0.
0X
31:29 - Reserved, user software should not write ones to reserved bits. The value read
from a reserved bit is not defined.
NA
Table 328. CAN Receive Data register A (CAN1RDA - address 0x4004 4028, CAN2RDA - address 0x4004 8028) bit
description
Bit Symbol Function Reset Value RM Set
7:0 Data 1 If the DLC field in CANRFS ³ 0001, this contains the first Data byte of the current
received message.
0X
15:8 Data 2 If the DLC field in CANRFS ³ 0010, this contains the first Data byte of the current
received message.
0X
23:16 Data 3 If the DLC field in CANRFS ³ 0011, this contains the first Data byte of the current
received message.
0X
31:24 Data 4 If the DLC field in CANRFS ³ 0100, this contains the first Data byte of the current
received message.
0X
Table 329. CAN Receive Data register B (CAN1RDB - address 0x4004 402C, CAN2RDB - address 0x4004 802C) bit
description
Bit Symbol Function Reset Value RM Set
7:0 Data 5 If the DLC field in CANRFS ³ 0101, this contains the first Data byte of the current
received message.
0X
15:8 Data 6 If the DLC field in CANRFS ³ 0110, this contains the first Data byte of the current
received message.
0X
23:16 Data 7 If the DLC field in CANRFS ³ 0111, this contains the first Data byte of the current
received message.
0X
31:24 Data 8 If the DLC field in CANRFS ³ 1000, this contains the first Data byte of the current
received message.
0X
To Next Page
Loading...
