HD404054 Datasheet, PDF (98/101 Pages) Hitachi Semiconductor – HMCS400-series microcomputers designed to increase program productivity with large-capacity memory

HD404054 Series/HD404094 Series
Notes On ROM Out
Please pay attention to the following items regarding ROM out.
On ROM out, fill the ROM area indicated below with 1s to create the same data size as 4-kword versions
(HD404054, HD404094 and HD40A4054). A 4-kword data size is required to change ROM data to mask
manufacturing data since the program used is for a 4-kword version.
This limitation apply to the case of using EPROM and the case of using data base.
ROM 2 kwords version:
HD404052, HD404092, HD40A4052
Address $0800 to $0FFF
Vector address
Zero-page subroutine
(64 words)
Pattern and program
(2048 words)
Not used
$0000
$000F
$0010
$003F
$0040
$07FF
$0800
$0FFF
Fill this area with all 1s
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