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)
Summary of Contents for H8S Family
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Page 70: ...Section 1 Overview Rev 1 00 Mar 12 2008 Page 22 of 1178 REJ09B0403 0100...
Page 108: ...Section 2 CPU Rev 1 00 Mar 12 2008 Page 60 of 1178 REJ09B0403 0100...
Page 116: ...Section 3 MCU Operating Modes Rev 1 00 Mar 12 2008 Page 68 of 1178 REJ09B0403 0100...
Page 152: ...Section 5 Interrupt Controller Rev 1 00 Mar 12 2008 Page 104 of 1178 REJ09B0403 0100...
Page 206: ...Section 6 Bus Controller BSC Rev 1 00 Mar 12 2008 Page 158 of 1178 REJ09B0403 0100...
Page 420: ...Section 9 14 Bit PWM Timer PWMX Rev 1 00 Mar 12 2008 Page 372 of 1178 REJ09B0403 0100...
Page 476: ...Section 12 Watchdog Timer WDT Rev 1 00 Mar 12 2008 Page 428 of 1178 REJ09B0403 0100...
Page 552: ...Section 14 CRC Operation Circuit CRC Rev 1 00 Mar 12 2008 Page 504 of 1178 REJ09B0403 0100...
Page 712: ...Section 18 I2 C Bus Interface IIC Rev 1 00 Mar 12 2008 Page 664 of 1178 REJ09B0403 0100...
Page 804: ...Section 19 LPC Interface LPC Rev 1 00 Mar 12 2008 Page 756 of 1178 REJ09B0403 0100...
Page 838: ...Section 20 Ethernet Controller EtherC Rev 1 00 Mar 12 2008 Page 790 of 1178 REJ09B0403 0100...
Page 964: ...Section 24 RAM Rev 1 00 Mar 12 2008 Page 916 of 1178 REJ09B0403 0100...
Page 1066: ...Section 25 Flash Memory Rev 1 00 Mar 12 2008 Page 1018 of 1178 REJ09B0403 0100...
Page 1098: ...Section 26 Boundary Scan JTAG Rev 1 00 Mar 12 2008 Page 1050 of 1178 REJ09B0403 0100...
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