Datasheet

Table Of Contents
Section 15 Universal Serial Bus Interface (USB)
Page 598 of 846 REJ09B0140-0900 Rev. 9.00
Sep 16, 2010
H8S/2215 Group
(1)
(2)
(3)
(3)
(3)
(3)
(4)
(4)
(4)
(4)
(5)
(6)
(7)
(7)
(7)
Software
standby mode
4 ms wait
for oscillator
to stabilize
2 ms wait for
USB operation
clock to stabilize
USB module sto
p
state
USB operation resume
s
(8)
(9)
(9)
(10)
(10)
(11)
(11)
(12)
(13)
(14)
(14)
(15)
(16)
(17)
(18)
(18)
(21)
(22)
(23)
(25)
USB bus state
IRQ6
ISR/IRQ6F
UIFR3/SPRSi
USPND
UIFR3/SPRSs
UIFR3/SOF
UCTLR/SFME
USB module
stop
Standby mode
System clock
(16 MHz)
Normal Suspend SOF
φ (16 MHz)
USB internal clock
(16 MHz)
UIFR3/
CK48READY
CLK48 (48 MHz)
USB operating clock
(48 MHz)
(19)
(19)
(24)
(20)
Resume Normal
Figure 15.37 USB Software Standby Mode Transition Timing
15.9.13 USB External Circuit Example
The USB external circuit examples are used for reference only. In actual board design, carefully
check the system operation. In addition, the USB external circuits examples cannot guarantee
correct system operation. The user must individually take measures against external surges or ESD
noise by incorporating protective diodes or other components if necessary.