HD64F7050 RENESAS [Renesas Technology Corp], HD64F7050 Datasheet - Page 77

• Manufacturer Part Number: HD64F7050
• Description: 32-Bit RISC Microcomputer SuperH RISC engine Family/
• Manufacturer: RENESAS [Renesas Technology Corp]

Crystal Oscillator: Figure 4.3 shows an equivalent circuit of the crystal oscillator. Use a crystal
oscillator with the characteristics listed in table 4.4.
Table 4.4
4.3.2
An example of external clock input connection is shown in figure 4.4. When the external clock is
stopped in standby mode, ensure that it goes high.
When the XTAL pin is placed in the open state, the parasitic capacitance should be 10 pF or less.
Even when an external clock is input, provide for a wait of at least the oscillation settling time
when powering on or exiting standby mode in order to secure the PLL settling time.
Parameter
Rs max ( )
C0 max (pF)
External Clock Input Method
External clock input
Crystal Oscillator Parameters (Recommended Values)
EXTAL
Figure 4.4 External Clock Input Method (Example)
Figure 4.3 Crystal Oscillator Equivalent Circuit
4
120
7
L
8
80
7
C
C
L
0
Open
Frequency (MHz)
Section 4 Clock Pulse Generator (CPG)
Rev. 5.00 Jan 06, 2006 page 57 of 818
Rs
XTAL
EXTAL
XTAL
10
60
7
REJ09B0273-0500