Fujitsu FR81S User Manual
CHAPTER 41: CAN
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: CAN
FUJITSU SEMICONDUCTOR CONFIDENTIAL
79
Figure 5-2 CPU Processing of FIFO Buffer
Message interrupt
Start
Reading the CAN
Interrupt register
8000
H
0000
H
CAN Interrupt register value
Other than 8000
H
, and 0000
H
Message number = CAN interrupt register value
Execute the status
interrupt processing
End
(Normal process)
Writing the IFx command request register
(message number)
Reading the message
Interface register
(Reset : NewDat=0, IntPnd=0)
Reading the IFx message
control register
Reading the IFx message
data register A, B
NewDat = 1
No
Yes
Yes
No
Message number = Message number + 1
EoB = 1
MB91520 Series
MN705-00010-1v0-E
1772