Datasheet

Section 15 Universal Serial Bus Interface (USB)
Page 504 of 846 REJ09B0140-0900 Rev. 9.00
Sep 16, 2010
H8S/2215 Group
Bit Bit Name Initial Value R/W Description
5
4
3
2
UCKS3
UCKS2
UCKS1
UCKS0
0
0
0
0
R/W
R/W
R/W
R/W
1000: Uses a clock supplied by the 48-MHz external
clock (EXTAL48 pin input) directly. The PLL
stops. The USB operating clock stabilization
time is 246 to 200 μs
.
1001 (H8S/2215): Reserved
1001 (H8S/2215R, H8S/2215T and H8S/2215C): Uses
the clock supplied by the 48-MHz external clock
(EXTAL48 pin input) directly. The PLL stops.
The USB operating clock stabilization time is
300 to 200 µs (when using a 16-MHz to 24-MHz
system clock).
1010: Reserved
1011: Reserved
1100: Uses the USB operating clock (48 MHz) directly.
The PLL stops. The USB operating clock
stabilization time is 9.9 to 8 ms
.
1101 (H8S/2215): Reserved
1101 (H8S/2215R, H8S/2215T and H8S/2215C): Uses
the USB operating clock (48 MHz) directly. The
PLL stops. The USB operating clock
stabilization time is 12 to 8 ms (when using a
16-MHz to 24-MHz system clock).
1110: Reserved
1111: Reserved
Note that the USB operating clock stabilization time
differs according to the selected clock source and is
automatically counted by the system clock. The USB
operating clock stabilization time shown above is for
the case when the 13- to 24- MHz system clock is
used.