E202075_HD404889 Datasheet, PDF (195/202 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip LCD Circuit

HD404889/HD404899/HD404878/HD404868 Series
Note on ROM Ordering
Please note the following when ordering HD404874 or HD404864 ROM.
When ordering ROM, please fill the "Not used" areas below with all-1 data, to give the same amount of
data as for the 8-kwords version (HD404878, HD404868). The program that converts ROM data to mask
drawing data is the same as that used for the 8-kwords version, and therefore the same amount of data is
necessary. This applies both to orders using EPROM and orders using data transmission.
4-kword ROM
version: HD404874, HD404864
Write all-1 data to addresses
$1000 to $1FFF.
$0000
$000F
$0010
$003F
$0040
Vector addresses
Zero page
subroutine area
(64 words)
Program and pattern
area (4,096 words)
$0FFF
$1000
Not used
$1FFF
Note : Write all-1 data in shaded areas.
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