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CHAPTER 8 USB FUNCTION
User’s Manual U12978EJ3V0UD
100
Figure 8-3. Block Diagram of USB Timer
Internal bus
UWDERR
INTUSBTM
f
X
USBCLK
RESUME RX
Note
Clear circuit
Clock controller
Shift register
In high-
speed mode
In low-
speed mode
DATATX SE TORX
JUDGE TX
Note
JUDGE TOKEN
Note
TX MASTER EN
Note
SETRX
Note
OUT RX
Note
USB timer start reservation
control register (USBTCL)
Note As these signals are used internally, confirmation by software is not possible.
Remark fX
: System clock oscillation frequency
UWDERR: Bit 7 of packet receive status register (RXSTAT)