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APPENDIX D Programming Specifications for One-Time PROM And EPROM Microcontroller
■ Recommended screening conditions
High-temperature aging is recommended as the pre-assembly screening procedure for a product with a
blanked OTPROM microcomputer program.
Table D.1-2 "Screening procedure" shows the screening procedure.
Figure D.1-2 Screening procedure
■ Programming to the EPROM
In EPROM mode, the MB89P955 function is equivalent to the MBM27C256A
●
Programming procedure:
1. Set the EPROM programmer to the MBM27C256A
2. Load program data from 4000
H
to 7FFF
H
of the EPROM writer (Note that 0C000
H
to 0FFFF
H
in the
operation mode are equivalent to 4000
H
to 7FFF
H
in the EPROM mode). Load option data from 3FF0
H
to 3FF6
H
of the EPROM programmer (See Bit map on the next page for the correspondence to each
option).
3. Program with the EPROM programmer.