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is it possible to shiftout "nothing" to a shift register? meaning if i have a line of code that is shifting out bytes to several daizy- chained shift registers, and then i need to shiftout data to only the third shift register in the chain, is it possible without effecting the other shift registers? thank you

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No. You have to shift it a line of 0's (or 1's, depending on your definition of nothing) On Dec 9, 2003, at 12:20 AM, limorgarcia wrote: > is it possible to shiftout "nothing" to a shift register? meaning if > i have a line of code that is shifting out bytes to several daizy- > chained shift registers, and then i need to shiftout data to only > the third shift register in the chain, is it possible without > effecting the other shift registers? > thank you > ------------------------ Yahoo! Groups Sponsor > ---------------------~--> > Buy Ink Cartridges or Refill Kits for your HP, Epson, Canon or Lexmark > Printer at MyInks.com. Free s/h on orders $50 or more to the US & > Canada. > http://www.c1tracking.com/l.asp?cid=5511 > http://us.click.yahoo.com/mOAaAA/3exGAA/qnsNAA/dN_tlB/TM > --------------------------------------------------------------------- > ~- > > -- Tom Igoe

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--- In , "limorgarcia" <limorgarcia@y...> wrote: > is it possible to shiftout "nothing" to a shift register? meaning if > i have a line of code that is shifting out bytes to several daizy- > chained shift registers, and then i need to shiftout data to only > the third shift register in the chain, is it possible without > effecting the other shift registers? If this ability is a requirement, you could redesign the circuit so that the shift registers are independently clocked. All the SRs could share the same data line but you'd need a separate clock for each. If you have the I/O pins available, the simplest way would be to use a different I/O pin for each shift register clock. To reduce the number of pins used, you can use a demultiplexer/decoder (e.g. 74LS138). Three I/O pins could specify which of 8 registers to clock and a fourth pin would strobe the enable of the decoder to produce the clock pulse. Don

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At 05:04 PM 12/9/2003 -0000, you wrote: > is it possible to shiftout "nothing" to a shift register? meaning if > i have a line of code that is shifting out bytes to several daizy- > chained shift registers, and then i need to shiftout data to only > the third shift register in the chain, is it possible without > effecting the other shift registers? <---What you could do is to use a registers that have a latch control line (like a 74HC595) and control each latch independently. That way, only the one(s) you select to change states will, with the latched one remaining in it's previous state. Ken ------ Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html Our new Repeater Audio Delay (RAD) board is now shipping! Compatible with many controllers! AH6LE/R - IRLP Node 3000 http://www.irlp.net

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