SH7606 Datasheet, PDF (229/532 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family / SH7606 Series

Section 8 Clock Pulse Generator (CPG)
8.6 Notes on Board Design
When Using an External Crystal Resonator: Place the crystal resonator, capacitors CL1 and
CL2, and damping resistor R close to the EXTAL and XTAL pins. To prevent induction from
interfering with correct oscillation, use a common grounding point for the capacitors connected to
the resonator, and do not locate a wiring pattern near these components.
Avoid crossing
signal lines
CL1
CL2
EXTAL
R
XTAL
This LSI
Note : Although the recommended value for CL1 and CL2 is
20pF and the recommended value for R is 0Ω, the
values should be determined after consultation with
the crystal manufacturer.
Figure 8.2 Points for Attention When Using Crystal Resonator
Bypass Capacitors: Insert a laminated ceramic capacitor as a bypass capacitor for each V_SS/V_SSQ
and V_CC/V_CCQ pair. Mount the bypass capacitors to the power supply pins, and use components
with a frequency characteristic suitable for the operating frequency of the LSI, as well as a suitable
capacitance value.
• Digital power supply pairs for internal logic
A4-B4, B11-A11, D15-D14, E2-E1, G12-G13, H4-H3, J12-J13, M1-M2, M8-N8, P5-R5
• Power supply pairs for input and output
A1-B1, A7-B7, A15-A14, F15-F14, K1-K2, M12-P14, M15-M14, R1-R2, R10-P10
• Power supply pairs for PLL
N13-N14, N13-P15
When Using a PLL Oscillator Circuit: Keep the wiring from the PLL V_CC and PLL V_SS
connection pattern to the power supply pins short, and make the pattern width large, to minimize
the inductance component.
The analog power supply system of the PLL is sensitive to noise. Therefore, the system
malfunction may occur by the intervention with other power supply. Do not supply the analog
power supply with the same resource as the digital power supply of V_CC and V_CCQ.
Rev. 4.00 Sep. 13, 2007 Page 203 of 502
REJ09B0239-0400