GMS36 Datasheet, PDF (99/109 Pages) Hynix Semiconductor – 4-BIT SINGLE CHIP MICROCOMPUTERS

Chapter 9. EPROM
3) Lock Bit Write Mode
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#. Note :
1. Internal system is reset at VPP = 12.5V and K2=`Low`
2. The reset release (K2=`High`) must be set within OSC1 = `Low` state.
(From this time, OSC1 clock is counted.)
3. If not written during 10 times repeats (120us), repeat the 5 times until all is written.
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