Fujitsu F2MC-8L MB89620 Series Hardware Manual page 320

Troubleshooting
Follow the checklist given below if problems occur.
As the problem may be related to software, also consult the manual of the software
you are using.
Checklist
The microcontroller does
not operate correctly.
External access does not
occur when operating in
external bus mode.
Performing evaluation
using the tools operates
correctly, but the one-time
or mask ROM product does
not operate correctly.
Check Items before Contacting Fujitsu
Collect the following information before contacting the Fujitsu Sales Department or agent:
(1) Determine the difference in the pin levels (waveforms) between when the device is operating
normally and abnormally.
(2) Determine how often the problem occurs, the conditions associated with the problem, the
number of items affected, and the effect of voltage, temperature and frequency on the
occurrence of the problem.
(3) Check the operation on one-time PROM, mask ROM, and piggy-back/evaluation products.
MB89620 series
Symptom
The power supply (V
not connected.
Not all pin inputs are within the
electrical characteristics of the
device.
The MOD1 and MOD0 pins are
not correct for the operation mode
being used (or incorrect mode
data is set).
No reset is applied after turning
the power on for a product that
does not have the power-on reset
option selected.
The oscillator is connected but no
oscillation is generated when
turning on the power or when
inputting a reset.
The MOD1 and MOD0 pins are
not correct for the operation mode
being used.
The mode data (FFFD
do not enable external access.
The RDY pin is at the "L" level or
high impedance.
Registers and RAM are not set to
their initial settings.
Cause
, GND) is Connect the power supply (V
CC
GND).
Ensure that all pin inputs are
within the electrical
characteristics of the device.
Set the MOD1 and MOD0 pins (or
set the mode data).
Input a reset after turning on the
power.
If an oscillation is present:
Check that the oscillation is at the
frequency of the connected
oscillator.
If no oscillation is present:
The device may have entered stop
mode (a standby mode). Check
the program.
Set the MOD1 and MOD0 pins.
) Enable external access.
settings
H
The CPU cannot go to the ready
state and therefore cannot
perform external access.
Pull-up the RDY pin if not using
the ready function.
If operation is unstable despite
repeatedly turning on the power
supply, initial values may not be
set.
Check
Measures
Column
,
CC
1