int e l DON’T CARE NEXT ADDRESS HIGH DON’T CARE NEXT ADDRESS LOW ADDRESS LOW DATA OUT DATA IN VERIFY BYTE PROGRAM NEXT BYTE FLOAT FLOAT 36 tcy 1 tcy 30 tcy 1 tcy SAMPLED tcy Figure 3B. EPROM Programming Timing for Version 1.1 1 tcy 30 tcy 1 tcy 30 tcy NOTE 1. This pulse is either 1 millisecond (INTELigent algorithm) or 50 milliseconds (normal algorithm). NOTE 2. When PROG command is executed, P1.5 goes low, and then the EPROM is read to see where to place the BASIC program. ADDRESS HIGH PORT 2 ADDRESS HIGH NOTE 1 tcy PROGRAM ONE BYTE NOTE 2 tcy 1 tcy PROGRAMMING PULSE PORT 1.4 READ P3.7 ADDRESS LOW/ DATA PORT 0 ALE DISABLE P1.3 EPROM VOLTAGE ENABLE P1.5 - 142 -