Friends, I need your generous helps. I am working on an ISD1420 voice chip which is controlled by AT89C51. I can record and playback the voice. The problem is when I recorded more than two messages into this chip and want to playback the certain message, why only the first message can be playbacked? I know I should care about the THOLD of ISD1420 (using delay function), but it did not work. Do you have any idea? Please save me. Thank you in advance.
Before you pose this same question again, please consider that it's quite completely off-topic, as stated. Your problem is obviously with that voice chip, not with your 8051 controller, and certainly not with Keil C51's way of building programs for that.