
15
MB90640A Series
s PROGRAMMING TO THE ONE-TIME PROM ON THE MB90P641A
MB90P641A has a function PROM mode function equivalent to MBM27C1000/1000A, so it can be written by
general ROM writer using special adapter. But take attention it doesn’t corsespond to the elctronic signature
(the device identification code) mode.
1. Programming Procedure
Memory map in the PROM mode is as below. Write option data to the option setting erea refering to the 6 PROM
option bit map.
Porocedure of the programing to the one-time PROM microcomputer is as below.
(1) Set the EPROM programmer for the MBM27C1000/1000A.
(2) Load the program data into the EPROM programmer at address*1 to 1FFFFH. When specify the PROM
option, load the option data to 00000H to 00002CH to refering to “6. PROM Option Bitmap”.
(3) Insert the device in the socket adapter, and mount the socket adapter on the EPROM programmer. Pay
attention to the orientation of the device and of the socket adapter when doing so.
(4) Program to 00000H to 1FFFFH.
Notes: Because the mask ROM products do not have a PROM mode, they cannot read date from the EPROM
programmer.
Contact the sales department when purchasing an EPROM programmer.
Note: The 00 bank ROM image is 48 Kbyes. (This is a ROM image for FF4000H to FFFFFFH.
Only when the ROM mirror function selecting resister is enable.)
Product
Address*1
Address*2
Number of bytes
MB90P641A
10000H
FF0000H
64 Kbytes
Normal operating made
FFFFFFH
010000H
004000H
000000H
Address*2
Program area
(PROM)
1FFFFH
0002CH
ROM image
00000H
Address*1
Program area
(PROM)
PROM mode
Mirror
Option
setting area