Hello, I am about to use a P89c669 in a design with external program memory. Problem is that the manual states that EA pin either disables external program memory when held HIGH, or disables internal flash when EA is held LOW. The feedback I got from Philips is that when EA is held HIGH (???) both external and internal memory can be used in a mixed mode. So the big question is, if I want to use both program memories, how do I do it? I would appreciate any help on it.
Thanks beforehand Dimitris