MB89953 datasheet(13/40 Pages) FUJITSU

13 / 40 page

MB89950 Series

s PROGRAMMING TO THE EPROM ON THE MB89P955

The MB89P955 is an OTPROM version of the MB89950 series.

1. Features

• 16-Kbyte PROM on chip

• 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 EPPROM

Functions equivalent to the MBM27C256A can be used in the MB89P955 EPROM mode. Accordingly, the user

can write data with a general-purpose EPROM writer by using a dedicated adapter. Note that the electrical

signature mode is not supported.

• Programming procedure

(1) Set the EPROM writer for the MBM27C256A.

(2) Load program data from 4000H to 7FFFH of the EPROM writer (Note that 0C000H to 0FFFFH in the operation

mode are equivalent to 4000H to 7FFFH in the EPROM mode).

Load option data from 3FF0H to 3FF6H of the EPROM writer (See Bit Map on the next page for the

correspondence to each option).

(3) Write the data with the EPROM writer.

0000H

Not available

PROM

16 KB

0080H

0280H

8000H

BFF0H

BFF6H

FFFFH

C000H

3FF0H

3FF7H

4000H

7FFFH

EPROM

16 KB

Vacancy

(Read value FFH)

Option area

Vacancy

(Read value FFH)

Single chip

EPROM mode

(Corresponding addresses on the EPROM programmer)

I/O

RAM

Not available

Option area

Not available

Address

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