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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
1268 of 1441
NXP Semiconductors
UM10503
Chapter 45: LPC43xx/LPC43Sxx C_CAN
2. drives CAN sample point signal to monitor the CAN controller’s timing.
3. drives recessive constant value.
4. drives dominant constant value.
The last two functions, combined with the readable CAN receive pin CAN_RD, can be
used to check the CAN bus’ physical layer.
The output mode of pin CAN_TD is selected by programming the Test Register bits TX1
and TX0 as described
.
Remark:
The three test functions for pin CAN_TD interfere with all CAN protocol
functions. The CAN_TD pin must be left in its default function when CAN message
transfer or any of the test modes Loo-back mode, Silent mode, or Basic mode are
selected.
45.7.3 CAN message handler
The Message handler controls the data transfer between the Rx/Tx Shift Register of the
CAN Core, the Message RAM and the IFx Registers, see
The message handler controls the following functions:
•
Data Transfer between IFx Registers and the Message RAM
•
Data Transfer from Shift Register to the Message RAM
•
Data Transfer from Message RAM to Shift Register
•
Data Transfer from Shift Register to the Acceptance Filtering unit
•
Scanning of Message RAM for a matching Message Object
•
Handling of TXRQST flags
•
Handling of interrupts