MB89636 Fujitsu Media Devices, MB89636 Datasheet - Page 16

• Manufacturer Part Number: MB89636
• Description: (MB89630 Series) 8-bit Proprietary Microcontroller
• Manufacturer: Fujitsu Media Devices

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DataSheet
16
4
MB89630 Series
4. Recommended Screening Conditions
5. Programming Yield
6. Erasure
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(1) Set the EPROM programmer to the MBM27C256A.
(2) Load program data into the EPROM programmer at 0007
(3) Load option data into addresses 0000
(4) Program with the EPROM programmer.
High-temperature aging is recommended as the pre-assembly screening procedure for a product with a blanked
OTPROM microcomputer program.
All bits cannot be programmed at Fujitsu shipping test to a blanked OTPROM microcomputer, due to its nature.
For this reason, a programming yield of 100% cannot be assured at all times.
In order to clear all locations of their programmed contents, it is necessary to expose the internal EPROM to an
ultraviolet light source. A dosage of 10 W-seconds/cm
dosage can be obtained by exposure to an ultraviolet lamp (wavelength of 2537 Angstroms (Å)) with intensity
of 12000 W/cm
filters should be removed from the UV light source prior to erasure.
It is important to note that the internal EPROM and similar devices, will erase with light sources having wave-
lengths shorter than 4000 Å. Although erasure time will be much longer than with UV source at 2537 Å,
nevertheless the exposure to fluorescent light and sunlight will eventually erase the internal EPROM, and
exposure to them should be prevented to realize maximum system reliability. If used in such an environment,
the package windows should be covered by an opaque label or substance.
Programming procedure
(Note that addresses 8000
(For information about each corresponding option, see “8. OTPROM Option Bit Map.”).
2
for 15 to 21 minutes. The internal EPROM should be about one inch from the source and all
H
to FFFF
H
in the operating mode assign to 0000
H
to 0006
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Data verification
Program, verify
+150 C, 48 Hrs
Assembly
Aging
H
2
of the EPROM programmer.
is required to completely erase an internal EPROM. This
H
to 7FFF
H
.
H
to 7FFF
H
in EPROM mode).