Motorola M68HC08 Designer Reference Manual page 24

USB and PS/2 Multimedia Keyboard Interface
USB INTERRUPT ROUTINE
NO
RETURN FROM INTERRUPT
Designer Reference Manual
24
Freescale Semiconductor, Inc.
EOP ?
YES
RESET SUSPEND COUNTER
SETUP ?
NO
OUT TOKEN
TO EP0 ?
NO
EP0 TX COMPLETED ?
NO
EP1 TX COMPLETED ?
NO
EP2 TX COMPLETED ?
NO
RESUME FORM
HOST?
NO
Figure 1-12. USB Interrupt Routine
USB and PS/2 Multimedia Keyboard Interface
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YES
SETUP HANDLER
YES
OUT EP0 HANDLER
YES
IN EP0 HANDLER
YES
DISABLE EP1 TRANSMIT &
CLEAR EP1 TX FLAG
YES
DISABLE EP2 TRANSMIT &
CLEAR EP2 TX FLAG
YES
CLEAR RESUME FLAG
DRM014 — Rev 0
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