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M306NKT-EPB User’s Manual 1. Outline
REJ10J0519-0200 Rev.2.00 Oct. 16, 2006 Page 17 of 104
(2) Target Status LEDs
The target status LEDs indicate operating status of the target MCU and power supply of the user system. Table 1.4 lists the
definition of each target status LED.
Table 1.4 Definition of the target status LEDs
Name Status Meaning
ON Power is supplied to the user system. POWER
OFF Power is not supplied to the user system.
ON Clock is supplied to the target MCU. CLOCK
OFF Clock is not supplied to the target MCU.
ON Target MCU is being reset, or reset signal of the user system is held low. RESET
OFF Target MCU is not being reset.
ON User program is being executed. RUN
OFF User program has been halted.
ON Addresses 00000h and 00001h have been read out wrongly. WARNING
OFF Addresses 00000h and 00001h have not been read out wrongly.
IMPORTANT
Note on Usage in Memory Expansion or Microprocessor Mode:
z When you use this product in memory expansion or microprocessor mode, be sure to design your system so that
pins RDY# and HOLD# are not held low at startup. Otherwise, it cannot startup normally.
Note on the Target Status POWER LED:
z If your MCU has two or more Vcc terminals, the LED does not light unless power is supplied to all the
terminals.
Note on the Target Status CLOCK LED:
z CLOCK LED is turned off when both main and sub clocks are not oscillating. If either clock is oscillating, the
LED is turned on.
z 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:
z With the M16C/60 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) of the PC7501’s upper panel lights up to alarm. When this LED lights, there is a
possibility of wrong read access, therefore check the user program.