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型號(hào)：	UPD703270GF-XXX-JBT
元件分類：	微控制器/微處理器
英文描述：	32-BIT, MROM, 20 MHz, RISC MICROCONTROLLER, PQFP100
封裝：	14 X 20 MM, PLASTIC, QFP-100
文件頁(yè)數(shù)：	839/1080頁(yè)
文件大小：	6965K
代理商：	UPD703270GF-XXX-JBT

CHAPTER 19 CAN CONTROLLER

User’s Manual U16541EJ4V0UD

19.8 CAN Controller Initialization

19.8.1 Initialization of CAN module

Before CAN module operation is enabled, the CAN module system clock needs to be determined by setting the

C0GMCS.CCP0 to C0GMCS.CCP3 bits by software. Do not change the setting of the CAN module system clock

after CAN module operation is enabled.

The CAN module is enabled by setting the C0GMCTRL.GOM bit.

For the procedure of initializing the CAN module, see 19.16 Operation of CAN Controller.

19.8.2 Initialization of message buffer

After the CAN module is enabled, the message buffers contain undefined values. A minimum initialization for all

the message buffers, even for those not used in the application, is necessary before switching the CAN module from

the initialization mode to one of the operation modes.

Clear the C0MCTRLm.RDY, C0MCTRLm.TRQ, and C0MCTRLm.DN bits to 0.

Clear the C0MCONFm.MA0 bit to 0.

m = 00 to 31

19.8.3 Redefinition of message buffer

Redefining a message buffer means changing the ID and control information of the message buffer while a

message is being received or transmitted, without affecting other transmission/reception operations.

(1) To redefine message buffer in initialization mode

Place the CAN module in the initialization mode once and then change the ID and control information of the

message buffer in the initialization mode. After changing the ID and control information, set the CAN module

to an operation mode.

(2) To redefine message buffer during reception

Perform redefinition as shown in Figure 19-38.

(3) To redefine message buffer during transmission

To rewrite the contents of a transmit message buffer to which a transmission request has been set, perform

transmission abort processing (see 19.10.4 (1) Transmission abort in normal operation mode, 19.10.4 (2)

Transmission abort process except for ABT transmission in normal operation mode with automatic

block transmission (ABT), and 19.10.4 (3)

Transmission abort in normal operation mode with

automatic block transmission (ABT)). Confirm that transmission has been aborted or completed, and then

redefine the message buffer. After redefining the transmit message buffer, set a transmission request using

the procedure described below. When setting a transmission request to a message buffer that has been

redefined without aborting the transmission in progress, however, the 1-bit wait time is not necessary.

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