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M3028BT-EPB User's Manual
(2) Target Status LEDs
The target status LEDs indicate the target MCU's operating status and target board's power supply. Table 1.4 lists the definition
of each target status LED.
Table 1.4 Definitions of the target status LEDs
Name
Status
POWER
ON
OFF
CLOCK
ON
OFF
RESET
ON
OFF
RUN
ON
OFF
WARNING
ON
OFF
Note on the Target Status POWER LED:
If your MCU has two or more VCC pins, the LED does not light unless power is supplied to all the pins.
Note on the Target Status CLOCK LED:
If the LED is not turned on, check the following.
(1) After powering on the PC7501 (before starting up the emulator debugger):
Make sure that the oscillator circuit board is properly installed in the PC7501 and it is oscillating normally.
(2) After the emulator debugger is started up (after the Init dialog box settings are completed):
Make sure that the oscillator selected in the Init dialog box is oscillating normally.
Note on Accessing Addresses 00000h and 00001h:
With the M16C/Tiny Series MCUs, when a maskable interrupt is generated, the interrupt data (interrupt number
and interrupt request level) stored in addresses 00000h and 00001h are read out. Also, the interrupt request bit is
cleared when address 00000h or 00001h is read out. Consequently, when the address 00000h or 00001h readout
instruction is executed or when address 00000h or 00001h is read out in the cause of a program runaway, a
malfunction occurs in that the interrupt is not executed despite the interrupt request, because the request bit of
the highest priority interrupt factor enabled is cleared.
For this malfunction, when the reading out to address 00000h or 00001h is generated excluding the interrupt,
the WARNING LED (yellow) on the PC7501 front panel lights up to alarm. When this LED lights, there is a
possibility of read access, therefore check the user program.
REJ10J1459-0200 Rev.2.00 Sep 16, 2006
Power is supplied to the user system.
Power is not supplied to the user system.
Target MCU clock is oscillating.
Target MCU clock is not oscillating.
Target MCU is being reset, or reset signal of the user system is held low.
Target MCU is not being reset.
User program is being executed.
User program has been halted.
Address 00000h or 00001h has been read out.
Address 00000h or 00001h has not been read out.
Meaning
CAUTION
1. Outline
Page 17 of 86
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