I am using a 89C450MCL mcu running at 29.492mhz With just the micro, 74F573 (or 74HCT573 tried both) and a IS62C1024-35 RAM chip it seems I loose the address sometimes at the output of the latch when /WR goes low. I am using plenty of bypas caps and 4.6uf caps for supply lines. I am simply trying to clear a memory range from 0000h - 00FFh. I put my logic probe on the address lines of the RAM chip after the latch and I can see the address sometimes going wrong. See
- posted
17 years ago