Fujitsu FR81S User Manual
CHAPTER 41: CAN
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: CAN
FUJITSU SEMICONDUCTOR CONFIDENTIAL
90
5.7.6. Software Control of the CAN_TX Pin
Software control of the CAN_TX pin is shown.
The CAN_TX pin, which is the CAN transmission pin, has four output functions as follows:
⋅
Serial data output (ordinary output)
⋅
CAN sampling point signal output for CAN controller bit timing monitoring
⋅
Fixed dominant output
⋅
Fixed recessive output
Fixed dominant and recessive outputs can be used to check the physical layer of the CAN bus together with
the CAN_RX monitoring function of the CAN reception pin.
The CAN_TX pin output mode can be controlled using the Tx1 and Tx0 bits of the CAN test register
(TESTR).
Note:
For CAN message transmission or operation in loopback, silent, or basic mode, the CAN_TX pin must be
configured for serial data output.
MB91520 Series
MN705-00010-1v0-E
1783