M38203M4 Datasheet, PDF (293/344 Pages) Mitsubishi Electric Semiconductor – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPENDIX
3.1 Built-in PROM version
3.1.5 Notes on use
Notes on using the built-in PROM version are described below.
(1) All products of built-in PROM version
sNotes on programming
qWhen programming the contents of the PROM, use the dedicated programming adapter. This per-
mits programming with a general-purpose PROM programmer.
At that time, set all of SW1, SW2 and SW3 in the above programming adapter to “OFF.”
qAs a high voltage is used for programming, be careful not to apply overvoltage to pins. Special care
must be exercised at poweron.
sNotes on reading
When reading out the contents of the PROM, use the dedicated programming adapter as in program-
ming. This permits reading out with a general-purpose PROM programmer.
At that time, set all of SW1, SW2 and SW3 in the programmer to “OFF.”
sNotes on using port P40
When using port P40 as an input port in the One Time PROM/EPROM version, connect a resistors
of several kΩ externally to port P40 in series. If this pin is not used, connect a resistor of several kΩ
externally to VSS in series (for improvement of the value withstand noise operation failure).
For details, refer to “3.2 Countermeasures against noise, 3.2.1 Shortest wiring length, (3) Wiring
to the VPP pin of the One Time PROM version and the EPROM version.”
(2) EPROM Version
sNotes on deleting
qSunlight and fluorescent lamps include light which may delete programmed information. For use in
the read mode, cover the transparent glass part of the delete window with a seal or others.
qThe seal to cover the transparent glass part is prepared by us.
This seal is metallic (aluminium) for reasons of prevention of information-deleting light and tough-
ness. Be careful not to bring this seal into contact with lead pins of the microcomputer.
qBefore deleting information, clean the transparent glass. Finger marks and seal paste may block
ultraviolet rays and effect delete characteristics.
sNotes on mounting
qTo mount the EPROM version for a purpose other than evaluation, use a suitable mounting socket.
When mounting a ceramic package on the socket, fix it securely with silicone resin.
3820 GROUP USER’S MANUAL
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