Ask Your Question

Revision history [back]

click to hide/show revision 1
initial version

The Memory Read cycle in 8085 Microprocessor can be depicted in a timing diagram as follows:

  1. The first step is the Address latch enable (ALE) signal, which goes high initially and remains high for one clock cycle.
  2. Then the microprocessor places the 16-bit memory address on the address bus during the next clock cycle. This is indicated by the Address signal on the timing diagram.
  3. The Read signal which is a low signal, goes low to indicate to the memory that the processor is ready to Read the data.
  4. The Memory responds by placing the data at the specified location on the data bus after a small delay called the access time. This line is marked as Data on the timing diagram.
  5. After the proper data access time, the microprocessor reads the data from the data bus during the next clock cycle. This is indicated by the Data signal on the timing diagram.
  6. Finally, the Read signal goes high, indicating to the memory that the operation is complete.

The above timing diagram depicts the Memory Read cycle in 8085 Microprocessor.