GMS36 Datasheet, PDF (100/109 Pages) Hynix Semiconductor – 4-BIT SINGLE CHIP MICROCOMPUTERS

Chapter 9. EPROM
4) Lock Bit Read 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. Lock data is outputted from D5 port.
If you set Lock bit, the output data of D5 is always `H`.
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