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Forum: µC & Digital Electronics Regarding DAD instruction in 8085


Author: varun maheshwari (Company: DEI) (varun_agr)
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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)

Author: Georg G (Guest)
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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.

Author: Gordon Shumway (Guest)
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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...

Gordon Shumway aka TOKABLN

Author: varun maheshwari (Company: DEI) (varun_agr)
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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...
>
> 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)

Author: Mohammad (Guest)
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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

Author: Savio (Guest)
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Plz can u help me to learn the opcode and operand from my exam and trick 
to remember them

Author: Himanshu.sarswat (Guest)
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Welder

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