Section 22 USB Function Module (USB)
Rev. 1.00 Mar. 12, 2008 Page 894 of 1178
REJ09B0403-0100
22.10.7 Restrictions on Peripheral Module Clock (
φ
) Operating Frequency
The USB clock select pin (UXSEL) can be used to select the clock source. To set the USB
dedicated clock (cku) at 48 MHz, specify the peripheral module clock (
φ
) as shown in table 22.8.
Operation cannot be guaranteed if any frequency other than in the following table is specified.
When UXSEL is set to 0, connect USEXTAL to the system power supply (0 V).
The USB operates only in high-speed mode and does not operate in medium-speed mode.
Table 22.8 Selection of Peripheral Module Clock (
φ
) when USB Connection is Made
UXSEL
UEXTAL Input
Frequency
EXTAL Input
Frequency
USB Dedicated Clock
(cku: 48 MHz)
φ
0
8.00
MHz
EXTAL
×
6
EXTAL
×
4 (32 MHz)
1
8.00 MHz
8.50 MHz
UEXTAL
×
6
EXTAL
×
4 (34 MHz)
Содержание H8S Family
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Страница 552: ...Section 14 CRC Operation Circuit CRC Rev 1 00 Mar 12 2008 Page 504 of 1178 REJ09B0403 0100...
Страница 588: ...Section 15 Serial Communication Interface with FIFO SCIF Rev 1 00 Mar 12 2008 Page 540 of 1178 REJ09B0403 0100...
Страница 632: ...Section 17 Synchronous Serial Communication Unit SSU Rev 1 00 Mar 12 2008 Page 584 of 1178 REJ09B0403 0100...
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Страница 838: ...Section 20 Ethernet Controller EtherC Rev 1 00 Mar 12 2008 Page 790 of 1178 REJ09B0403 0100...
Страница 964: ...Section 24 RAM Rev 1 00 Mar 12 2008 Page 916 of 1178 REJ09B0403 0100...
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Страница 1230: ...H8S 2472 Group H8S 2462 Group Hardware Manual...