MB89821 datasheet(13/43 Pages) FUJITSU

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MB89820 Series

s PROGRAMMING TO THE EPROM ON THE MB89P825

The MB89P825 is an OTPROM (one-time PROM) version for the MB89820 series.

1. Features

• 16-Kbyte PROM on chip

• Options can be set using the EPROM programmer.

• Equivalency to the MBM27C256A in EPROM mode (when programmed with the EPROM programmer)

2. Memory Space

Memory space in EPROM mode is diagrammed below.

3. Programming to the EPROM

In EPROM mode, the MB89P825 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 4000H to 7FFFH (note that addresses C000H to FFFFH

while operating as a single chip assign to 4000H to 7FFFH in EPROM mode).

Load option data into addresses 3FF0H to 3FF5H of the EPROM programmer. (For information about each

corresponding option, see “7. OTPROM Option Bit Map.”

(3) Program with the EPROM programmer.

Address

0000H

0080H

0180H

C000H

FFFFH

I/O

PROM

16 KB

RAM

BFF6H

BFF0H

8000H

Not available

Option area

EPROM mode

(Corresponding addresses on EPROM programmer)

4000H

7FFFH

EPROM

16 KB

3FF6H

3FF0H

0000H

Vacancy

(Read value FFH)

Vacancy

(Read value FFH)

Option area

Single chip

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