HD404849 Datasheet, PDF (123/125 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

HD404849 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 a 16-kword version
(HD404849). A 16-kword data size is required to change ROM data to mask manufacturing data since the
program used is for a 16-kword version.
This limitation applies when using an EPROM or a data base.
8-kword ROM version:
HD404848
Write all-1 data to addresses
$2000 to $3FFF
$0000
Vector address
$000F
$0010
$003F
$0040
$1FFF
$2000
Zero-page subroutine
(64 words)
Pattern & program
(8,192 words)
$3FFF
Not used
$0000
12-kword ROM version:
HD4048412
Write all-1 data to addresses
$3000 to $3FFF
Vector address
$000F
$0010
$003F
$0040
$2FFF
$3000
Zero-page subroutine
(64 words)
Pattern & program
(12,288 words)
$3FFF
Not used
Write all-1 data in shaded areas
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