GMS84512 Datasheet, PDF (103/123 Pages) Hynix Semiconductor – 8-BIT SINGLE CHIP MICROCOMPUTER

5.6.1 OTP CHIP WRITING METHOD
GMS 84512 / 84524
1. Programming Voltage (Vpp ) is 12.5 V
2. If you write FONT ROM, then set the switch to FONT.
3. And if you write program ROM, then set the switch to PROM.
4. You must use OTP file not HEX file.
5. You must set EPROM type to 27C256 in PROM writer.
6. You must program OTP chip two times. Because FONT ROM and Program ROM are internally
separated.
FONT
0000_H
( 8 K bytes )
1FEF_H
User Program
2000_H
( GMS84524 )
PROM WRITER
BUFFER ( RAM )
GMS84512T/84524T
0000_H
( 8 K bytes )
1FEF_H
2000_H
( 8 K bytes )
3FEF_H
Set switch to FONT
2000_H
( GMS84524 )
A000_H
( GMS84524 )
5000_H
( GMS84512 )
5000_H
( GMS84512 )
D000_H
( GMS84512 )
Set switch to PROM
7FFF_H
7FFF_H
FFFF_H
OTP File
¡ØBuffer data will be write into GMS84512T at
different address area by socket adapter.
l Cautionary notes.
For chip reliability, after write & aging, reading test is recommended.
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