SH7670 Datasheet, PDF (855/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Section 17 USB 2.0 Host/Function Module (USB)
(2) Power-off Procedure for USB Module
Turn off the power supplies for the USB module by a procedure listed below.
1. Set the USB communication off state with disabling the pull-up of the DP pin before turning
off the power supply of the USB module.
2. Clear the CKE bit of USBEXR to 0 and set both RST bit and PDE bit to 1.
• The current consumption can be reduced by the following two methods.
• Put the USB module to the module stop state.
• Clear the USBEN bit of UCLKCR to 0. However, it takes long time to the start of the USB
module in this case.
3. Turn off the power supplies for the USB module with the order that is turning off 1.2V-system
power supply after turning off 3.3V-system power supply.
Rev. 1.00 Nov. 14, 2007 Page 829 of 1262
REJ09B0437-0100