User`s manual

24
2.2.7 Selecting the Clock
This emulator supports three types of clock for the MCUs listed in table 2.2: a crystal oscillator attached on the
evaluation chip board, external clock input from the user system, and the emulator internal clock. The clock is
specified with the [Configuration Properties] dialog box.
Table 2.2 Maximum Operating Frequency of the System Clock
MCU Maximum Operating Frequency of the
System Clock (φ)
Frequency Range of the Crystal
Oscillator
H8SX/1650
H8SX/1657
35 MHz
H8SX/1651
H8SX/1653
H8SX/1654
H8SX/1663
H8SX/1664
50 MHz
8 to 18 MHz
Table 2.3 CLOCK Command
MCU Mode Clock CLOCK Command
MD_CLK_0 12 (Emulator clock: 12 MHz)
16 (Emulator clock: 16 MHz)
Target (External clock: 8 to 18 MHz)
Xtal (Crystal oscillator: 8 to 18 MHz)
H8SX/1653
H8SX/1654
H8SX/1663
H8SX/1664
MD_CLK_1 16 (Emulator clock: 16 MHz)
Target (External clock: 8 to 18 MHz)
Xtal (Crystal oscillator: 8 to 18 MHz)
H8SX/1650
H8SX/1657
H8SX/1651
⎯ 12 (Emulator clock: 12 MHz)
16 (Emulator clock: 16 MHz)
Target (External clock: 8 to 18 MHz)
Xtal (Crystal oscillator: 8 to 18 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 as shown in table 2.2.
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 evaluation chip board (figure 2.6).
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.