User`s manual

13
2.2.5 Selecting the Clock
This emulator supports three types of clock for the MCU: a crystal oscillator attached on the emulator’s front-
end unit, external clock input from the user system, and the emulator internal clock. The clock is specified with
the [Configuration] dialog box.
This emulator can use a clock source (φ) running at up to 40.0 MHz as the H8SX/1527 clock input. The
H8SX/1582 or H8SX/1527R can operate with clock sources (φ) running at up to 48.0 MHz.
Crystal Oscillator: A crystal oscillator is not supplied with the emulator. Prepare and use one that has the same
frequency as that of the user system. When using a crystal oscillator as the MCU clock source, the frequency
range must be from 4 to 9 MHz.
CAUTION
Always switch OFF the emulator and user system before
connecting or disconnecting the CRYSTAL OSCILLATOR.
Otherwise, the USER PROGRAM will be LOST.
Follow the procedure listed below to install the crystal oscillator:
1. Check that the emulator power switch is turned off. (Check that the power LED is not lit.)
2. Attach the crystal oscillator into the terminals on the emulator’s front-end unit (figure 2.3). Be careful to
ensure that the terminals do not touch the casing.
3. Turn on the user system power and then the emulator power. The crystal oscillator will then be automatically
set and started up. This function will allow the execution of the user program at the operating frequency of
the user system even when the user system is not connected to the emulator.