Motorola M68HC08 Designer Reference Manual page 13

DRM014 — Rev 0
MOTOROLA
Freescale Semiconductor, Inc.
INITIALIZATION
DELAY 350ms (POWER ON DELAY)
ENABLE USB D– PULLUP
D+ HIGH FOR 1ms ?
OVER 10 SECONDS ?
USB RESET?
D+ HIGH FOR 1ms ?
SETUP DETECTED ?
NO
OVER 10 SECONDS ?
Figure 1-7. USB and PS/2 Detection
USB and PS/2 Multimedia Keyboard Interface
For More Information On This Product,
Go to: www.freescale.com
USB and PS/2 Multimedia Keyboard Interface
YES
NO
YES
NO
NO
YES
YES
NO
YES
NO
YES
Firmware Description
PS/2
USB
PS/2
USB
USB
Designer Reference Manual
13