Can anybody tell me about DAD instruction in 8085. Is ALE high twice in first machine cycle of DAD instruction. Can anybody suggested me timing diagram of DAD and HLT instruction.(Any other link)
DAD is a single byte instruction. So there is only one ALE pulse. HLT is fetch cycle followed by 1 or more wait cycles. Once HLT is executed it inserts wait states in every clock period until the chip is reset or an interrupt occurs. Address and data bus are floating.
Sometimes I wonder why people don't use the internet search capabilities... I just entered "8085 instruction set machine cycle" and I received the following catch... http://www.phy.davidson.edu/fachome/dmb/py310/EMAC_Primer/8085.InstructionSet.full.pdf Gordon Shumway aka TOKABLN
Gordon Shumway wrote: > Sometimes I wonder why people don't use the internet search > capabilities... > I just entered "8085 instruction set machine cycle" and I received the > following catch... > > http://www.phy.davidson.edu/fachome/dmb/py310/EMAC_Primer/8085.InstructionSet.full.pdf > > Gordon Shumway aka TOKABLN Sir I know the DAD instruction is one byte instruction and taking three machine cycles. But I want to know whether ALE high twice in opcode fetch cycle or not. Can any idea of its timing diagram.(or any link)
varun m. wrote: > Can anybody tell me about DAD instruction in 8085. Is ALE high > twice in first machine cycle of DAD instruction. Can anybody suggested > me timing diagram of DAD and HLT instruction.(Any other link) More information
Plz can u help me to learn the opcode and operand from my exam and trick to remember them
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