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hi I'm using a dual port ram (idt 7008 64K). How can i measure the eight lowest adresslines? The ALE pin keep clocking. The eight higher adresslines can i measure and are correct. Do i need something to set for the ALE pin ?? Greetz
Do you understand the operation of the Multiplexed Address/Data Bus, and the function of ALE in demultiplexing it? It's all described right at the start of the "80C51 Family Architecture" document: http://www.semiconductors.philips.com/acrobat/various/80C51_FAM_ARCH_1.pdf While you're about it, you should probably also read these two documents: http://www.semiconductors.philips.com/acrobat/various/80C51_FAM_PROG_GUIDE_1.pdf http://www.semiconductors.philips.com/acrobat/various/80C51_FAM_HARDWARE_1.pdf Together, these 3 documents are often referred to as "the bible" for the 8051 family, because they are fundamental to any use of the 8051 family. You will not get far without needing the information in these documents!