HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 103

• Manufacturer Part Number: HD6417144
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

A circuitry shown in figure 4.6 is recommended as an external circuitry around the PLL. Place
oscillation stabilization capacitor C1 close to the PLLCAP pin, and ensure that no other signal
lines cross this line. Separate the PLL power lines (PLLVcc, PLLVss) and the system power lines
(Vcc, Vss) at the board power supply source, and be sure to insert bypass capacitors CB and CPB
close to the pins.
In principle, electromagnetic waves are emitted from an LSI in operation. This LSI regards the
lower of the system clock (φ) and the peripheral clock (Pφ) as fundamental (for example, if φ = 40
MHz and Pφ = 40 MHz, then 40 MHz), and the peak of electromagnetic waves is in the high
frequency band. When this LSI is used adjacent to apparatuses sensible to electromagnetic waves
such as FM/VHF band receivers, it is recommended to use a board with at least four layers and
provide a layer exclusive to the system ground.
Note: * CB and CPB are laminated ceramic type.
Figure 4.6 Recommended External Circuitry around PLL
PLLCAP
PLLV
PLLV
V
V
CC
CC
SS
SS
R1=3kΩ
CPB = 0.1 μF *
CB = 0.1 μF *
Rp=200Ω
C1: 470 pF
(Values are recommended values.)
Rev.4.00 Mar. 27, 2008 Page 59 of 882
4. Clock Pulse Generator
REJ09B0108-0400