I'm using an 8051 controller card built in 2 counter and latching
buffer. I have to display on two 7 segments displays, however I have 5
output pins. I use the first four data pins to two latches and I use the
last data pin on an inverter for selecting which latch to display.

Problem: When the thing runs, it starts to count from 00 to 19 smoothly, when it comes to 20, both latches was enabled and it become 22 and later it reset to 11. What is the problem? Can anyone help....

Thanks... Wish all Happy New Year...