HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 593

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Note on External Clock Switchover
When using two or more external clocks (e.g. 10 MHz and 32 kHz), input clock switchover should
be carried out in software standby mode.
A sample external clock switching circuit is shown in figure 17.7, and sample external clock
switchover timing in figure 17.8.
Control
circuit
External clock 1
External clock 2
Figure 17.7 Sample External Clock Switching Circuit
External clock switchover signal
External clock switchover request
External interrupt signal
Rev.3.00 Mar. 26, 2007 Page 551 of 772
Section 17 Clock Pulse Generator
Port output
External interrupt
EXTAL
H8S/2245
REJ09B0355-0300