Hello,
I hope you can help, I'll try to explain what I'm trying to do rather than what I want..
I'm working with the 16F877A and need to interface to several data busses and minimise on single pin usage, each width being 8 bits, well one is 16 bits wide but I can treat that as two 8 bit interfaces and load one and then the other (I hope). It would be useful if the outer latches maintained their values when switching to the next switch 'chip'. CS
The ideal scenario would be to have a single port (PORTA?) interfaced to all of the chips, and say PORTB selecting the individual chips.
I've seen in the older reference manuals (early 1990's) mentions of chips that could possibly do this, described as 8-pole / octal 'digital' switches and with 40P/DIP profile. Response time being at about 7nS or so. 10nS to
50nS response time would be fine.Before I go, I have to use the 16F877 as we have a bit of stock of these and this is a prototype project, also I'm running at 20Mhz / 200nS instruction speed.
Thanks in anticipation of any help you can provide,
techie_a