What do these arrows represent? Is there any way to memorize it easily?

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  • 1
    \$\begingroup\$ Out of interest, why would you need to memorise them? \$\endgroup\$ Sep 22, 2018 at 13:44
  • 3
    \$\begingroup\$ This is precisely what these arrows are here for: to designate signal directions, so you don't need to "memorize" the major pin function. \$\endgroup\$ Sep 22, 2018 at 16:45
  • \$\begingroup\$ @SteveMelnikoff i have a test on microprocessors . i have to draw pin config and architecture of various processors . \$\endgroup\$
    – Mark Henry
    Sep 23, 2018 at 5:36
  • \$\begingroup\$ Argh; I used to hate stuff like that. The good news is that, in the real world, you can refer to datasheets as often as you like. :-) \$\endgroup\$ Sep 27, 2018 at 11:25

1 Answer 1


They indicate data direction. Arrows pointing to the chip indicate that those pins are inputs and vice versa. Bidirectional arrows indicate they are either inputs/outputs, depending on the circumstances.

If you want to memorize it, I think you should memorize those pins meanings first.

  • \$\begingroup\$ yea i have memorized the pins , the problem is that some pins have 2 arrows and some dont . \$\endgroup\$
    – Mark Henry
    Sep 22, 2018 at 4:16
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    \$\begingroup\$ @MarkHenry The double arrows represent pins that are bidirectional - may be either input or output, depending on the circumstances. \$\endgroup\$
    – DoxyLover
    Sep 22, 2018 at 5:20

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