int e l XTAL AT 12 MHz WHEN USING THE INTELLIGENT ALGORITHM (FPROG) THE LENGTH OF THE LAST PROGRAMMING PULSE IS THREE TIMES THE TOTAL NUMBER OF PULSES AFTER THE PROM IS PROGRAMMED. Figure 3A. EPROM Programming Timing Version NOTE: HORIZONTAL TIME SCALE IS NOT TCY - 12 ; TCY – 1 us 40 TCY MIN 82 TCY MIN EPROM PROGRAMMING TIMING LOW ORDER ADDRESS VALID HIGH ORDER ADDRESS VALID DATA VALID 1 MS IF INTELLIGENT ALGORITHM USED 50 MS 1 TCY 1 TCY 6 TCY MIN PORT 1.4 PROGRAMMING PULSE P1.5 EPROM VOLTAGE ENABLE P1.3 ALE DISABLE PORT 0 PORT 2 - 141 -