HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 100

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

4. Clock Pulse Generator
Table 4.3
4.1.2
Figure 4.4 shows an example of an external clock input connection. In this case, make the external
clock high level to stop it when in software standby mode. During operation, make the external
input clock frequency 4 to 12.5 MHz.
When leaving the XTAL pin open, make sure the parasitic capacitance is less than 10 pF.
Even when inputting an external clock, be sure to wait at least the oscillation stabilization time in
power-on sequence or in releasing software standby mode, in order to ensure the PLL stabilization
time.
Rev.4.00 Mar. 27, 2008 Page 56 of 882
REJ09B0108-0400
Frequency (MHz)
Rs max (Ω)
C
0
max (pF)
External Clock Input Method
Crystal Resonator Characteristics
EXTAL
Figure 4.4 Example of External Clock Connection
XTAL
4
120
7
8
80
7
Open state
External clock input
10
60
7
12.5
50
7