H8SXSLASH1663R datasheet(1064/1504 Pages) RENESAS

1064 / 1504 page

Section 20 USB Function Module (USB)

Rev. 2.00 Sep. 24, 2008 Page 1032 of 1468

REJ09B0412-0200

20.10.7

Restrictions on Peripheral Module Clock (P

φ) Operating Frequency

Specify the peripheral module clock (P

φ) for the USB at 14 MHz or more. To set the USB

dedicated clock (cku) at 48 MHz, specify the peripheral module clock (P

φ) as shown in table 20.8.

Operation cannot be guaranteed if any frequency other than in the following table is specified.

Table 20.8

Selection of Peripheral Clock (P

φ) when USB is Connected

MD_CLK

EXTAL Input Clock

Frequency

USB Dedicated Clock

(cku: 48 MHz)

12 MHz

EXTAL

× 4

EXTAL

× 2 (24 MHz)

EXTAL

× 1 (16 MHz)

16 MHz

EXTAL

× 3

EXTAL

× 2 (32 MHz)

20.10.8

Notes on Deep Software Standby Mode when USB is Used

1. Unlike software standby mode, deep standby software mode is canceled from the reset state.

For details, see section 28.8, Deep Software Standby Mode.

2. If the RAMCUT bit is set to 1 when the USB enters deep software standby mode, the register

states of the USB cannot be retained. When USB is used, set the RAMCUT bit to 1, and then,

make the USB enter deep software standby mode.

3. Set the USB module stop (MSTPC11) bit to 0 after canceling deep software standby mode.

4. If the DUSBIE bit is set to 0 when the USB enters deep software standby mode, software

standby mode cannot be canceled through USB RESUME interrupt. Set the DUSBIE bit to 1,

and then, make the USB enter deep software standby mode.

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