GMS30004 Datasheet, PDF (122/158 Pages) Hynix Semiconductor – 4-BIT SINGLE CHIP MICROCOMPUTERS

ê Appendix C Magic-
1. Function
1) Stand-by
Output of D0~D3 is ÌLÌ
Oscillation is stop
Output of D4~D5 are held to ÌHÌ
2) Condition of stand-by mode
After reset
When scan strobe output is over, there is not any key input.
3) Release of stand-by mode
One of the key scan input (K0~K3, R0~R3) is change to ÌLÌ level
C-2