SH7727 Datasheet, PDF (796/1109 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7700 Series

Section 23 USB Function Controller
23.9.7 Peripheral Clock (Pφ) Operation Frequency
The peripheral clock frequency (Pφ) should be 13 MHz or above when using this module.
Rev. 5.00 Dec 12, 2005 page 724 of 1034
REJ09B0254-0500