r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 985

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

(2)
If the USB bus enters the non-suspend state from the suspend state by resume signal output from
up-stream, perform the operation as shown in figure 16.6.
Resume Operation from Up-Stream
USB bus in suspend state
USB cable connected
Resume interrupt is
requested from the
up-stream.
Suspend/resume
interrupt occurs.
(IFR0/SURSF = 1)
48-MHz USB clock
oscillation started
USB function
Figure 16.6 Resume Operation from Up-Stream
USBINTN2 or
USBINTN3
RESUME
Clear SSRSME IN IER0 to 0.
Check if SURSS in IFR0 is 0.
Clear SURSF in IFR0 to 0.
Set SURSFE in IER0 to 1.
Return to normal state.
Rev. 1.00 Sep. 19, 2008 Page 955 of 1342
Section 16 USB Function Module (USB)
Cancel software standby mode.
Wait for system clock oscillation
to be settled.
Wait for 48-MHz USB clock
oscillation to be settled.
Cancel 48-MHz USB clock
module stop.
(EXMSTPCRL/MSTP17 = 0)
Application
REJ09B0467-0100