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Busy /Ack Time

State Action bat baT bAt bAT Bat BaT BAt BAT
1 Get next byte of data
T=0.5us Release /Strobe, Assert Data		 1 5 1a 2b 1 6 4
2 T=0.5us, Assert /Strobe, Assert Data 2 1 2c 6 5 3d 3
3 T=0.5us, Release /Strobe, Assert Data 5 3 4 3 4 3e 4f
4 T=10s, Release /Strobe and Data 5i 4h 1 5 4g 6
5 T=5ms, Release /Strobe and Data 5j 6 1k 5 5 4
  1. a: bAt - Printer not Busy, has released /Ack, we assert data without /Strobe and wait .5us

    b: bAT - We have been waiting .5us, now its time to:

  2. c: bAt - Printer still not Busy, /Ack released, we keep data on and assert /Strobe

    d: BAt - We have a Busy from the printer in response to our /Strobe. Do we need to wait anyway? If so make this a 2 and move to 3 when BAT.

  3. e: BAt - We can release /Strobe since the printer responded to it and just need to keep the data on for another .5us.

    f: BAT - Data was kept up for .5us, now we can:

  4. g: BAt - Release the data and wait for a long while to let the printer work.
    h: bAt - The printer is finished working on the data, but has not yet acknowledged reciept

    i: bat - The printer is asserting /Ack

  5. j: bat - We believe we have sent a byte to the printer. Now we just wait for the /Ack to release

    k: bAt - The /Ack is over, we can repeate the process.

1 2 3 3 4 4 5

Busy

 _ _ ~ ~ ~ _ _

/Ack

 ~ ~ ~ ~ ~ ~ _

/Strobe

 ~ _ _ ~ ~ ~ ~

Data

 D D D - - - -

file: /techref/io/parallel/states.htm, 6KB, , updated: 2008/3/18 09:57, local time: 2009/11/22 02:40,
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Robotics nuts!

Check out http://www.verinet.com/~dlc/ email: dlc@verinet.com... This guy ROCKS! He has made (and sells but also releases code, docs, etc...) for a number of cool little robotic modules including whiskers, IR proximity detect and remote control, Sonar proximity detect, PWM, Servo, compass. Most of these use the little PIC 12C508 controller which costs basically nothing and is soooo tiny.
The 4 servos, 2400 baud serial servo controller is a wonder of magic and he sells the programmed chip for $8. Wow!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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