HD404639R Datasheet, PDF (133/135 Pages) Renesas Technology Corp – 4-Bit Single-Chip Microcomputer

HD404639R 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
(HD404639R, HD40A4639R). 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.
ROM 8-kword version:
HD404638R, HD40A4638R
Address $2000–$3FFF
$0000
$000F
$0010
$003F
$0040
$1FFF
$2000
$3FFF
Vector address
(16 words)
Zero-page subroutine
(64 words)
Pattern & program
(8,192 words)
Not used
Fill this area with 1s
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