I am going  to order a couple of these and would like to get started coding
on it.  The Pinout that I got from TI looks different that those listed by
Mircea below, and I am trying to get some things clear.

(T/F)
1.I must use 3 IO to control the shift register. (data, srclr, clock)
2.  Any time I adjust a bit, I must set/reset them all (shifting).
3. To code for this puppy, I will need a delay, clock routine of 5khz
        a clock line low (for not yet determined amount of time)
        a data send routine
        a clock high (for a not yet determined amount of time)
4. I only have to clock when updating register
5. If I used 2 shift registers, I could use the same line for clock on both
        since clock by itself won't affect register.

Am I close to right so far?

I realize that using a different PIC would save trouble, but if I wasn't
half doing this
for educational reasons, I would take up basket weaving or something. ;-)

Anyone have any code to share on this subject using a 16f84a or compat?
Preferably at 20mghz (no small counters)?
--- just thought I would ask.

Thanks

Mircea wrote on another topic: (Thanks Mircea)

>Wire the HC959 (shift register) as follows:
>- pin 14. is the data line
>- pin 11 wired to pin 12 are clock line
>- pin 10 is reset line
>- pin 13 wired to pin 8 is GND
>- pin 16 is +5V
>- pin 15 is bit0
>- pin 1 is bit1
>- pin 2 is bit2
>- pin 3 is bit3
>- pin 4 is bit4
>- pin 5 is bit5
>- pin 6 is bit6
>- pin 7 is bit7
>- pin 9 is used for cascading two or more left NC

>To "talk" to HC595 (shift register) you have to:
>1. generate a reset pulse to clean up the register (that's optional, but
>recommanded, so you'll bee shure that next data will start from 0)
>2. get clock line low
>3. put the data line coresponding to the bit you want to send
>4. get the clock line high
>5. repeat steps 2,3 and 4 eight times to set all 8 outputs
>Simple as that.

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