
MB89670AR Series
DS07-12537-2E
17
3. Programming to the PROM
In EPROM mode, the MB89P677A functions equivalent to the MBM27C256A. This allows the PROM to be
programmed with a general-purpose EPROM programmer (the electronic signature mode cannot be used) by
using the dedicated socket adapter.
Programming procedure
(1) Set the EPROM programmer to the MBM27C256A.
(2) Load program data into the EPROM programmer at 0007H to 7FFFH (note that addresses 8007H to FFFFH
while operating as a single chip assign to 0007H to 7FFFH in the EPROM mode).
Load option data into addresses 0000H to 0006H of the EPROM programmer. (For information about each
corresponding option, see “7. Setting OTPROM Options”.)
(3) Program with the EPROM programmer.
4. Recommended Screening Conditions
High-temperature aging is recommended as the pre-assembly screening procedure for a product with a blanked
OTPROM microcomputer program.
5. Programming Yield
Due to the nature of the blanked OTPROM microcomputer, bit programming test can’t be conducted as Fujitsu’s
shipping test. Therefore a programming yield of 100% cannot be assured at all times.
Program, verify
Aging
+150
°C, 48 Hrs.
Data verification
Assembly