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M30245 Group
USB function interrupt request detected
USBIS → Read one word and store it to RAM
RAM → Write one word to USBIC
Completion of USB funxtion interrupt process
Figure 2.8.26. USB function interrupt processing routine
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
RAM,bit8=1?
Y
USB error
interrupt routine
RAM,bit1=1 or
RAM,bit3=1 or
RAM,bit5=1 or
RAM,bit7=1
Y
USB endpoint x OUT
interrupt routine
RAM,bit0=1 or
RAM,bit2=1 or
RAM,bit4=1 or
RAM,bit6=1
Y
USB endpoint x IN
interrupt routine
page 160 of 354
•Enables each interrupt by the USBIE (address 0288
at initial routine
•Clears USB interrupt status register 1, 2 by writing "1"
to the bit corresponding to the USBIC.
N
•Executes error handling of endpoint 0 to 4.
N
N
2. USB function
~0289
)
16
16
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