Renesas User System Interface Board HS7047ECH61H Manual de usuario descargar pdf (Pagina 33)

2.2.4 Selecting the Clock

This emulator supports three types of clock for the target MCU: 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] dialog box.

This emulator can use a clock source (φ) running at up to 50.0 MHz (four times the external clock frequency of

12.5 MHz) as the MCU clock input. Select one of the followings:

Target External clock (clock signal supplied from the user system to the EXTAL pin):

4.0 to 12.5 MHz

Xtal Crystal oscillator: 5.0 to 12.5 MHz

12.5 MHz Emulator internal clock

10 MHz Emulator internal clock

8 MHz Emulator internal clock

6 MHz Emulator internal clock

4 MHz Emulator internal clock

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 target MCU clock source, the

frequency range must be from 5.0 to 12.5 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 evaluation chip board (figure 2.4).

3. Turn on the user system power and then the emulator power. Then the crystal oscillator will be automatically

set. 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.

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Renesas User System Interface Board HS7047ECH61H Manual de usuario Pagina 33