SH7046 Datasheet, PDF (95/611 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7046 Series

Section 4 Clock Pulse Generator
Electromagnetic waves are radiated from an LSI in operation. This LSI has an electromagnetic
peak in the harmonics band whose primary frequency is determined by the lower frequency
between the system clock (φ) and peripheral clock (Pφ). For example, when φ = 50 MHz and Pφ =
40 MHz, the primary frequency is 40 MHz. If this LSI is used adjacent to a device sensitive to
electromagnetic interference, e.g. FM/VHF band receiver, a printed circuit board of more than
four layers with planes exclusively for system ground is recommended.
Rev. 4.00 Dec 05, 2005 page 51 of 564
REJ09B0270-0400