Accelerometer | ADC | ADXL | Adxl20 | AVR | BasicStamp | BX-35 | BX28 | BX35 | COM3 | Compiler | Downloader | EEPROM | Electromagnet | GetADC | GP2D1 | GPS | I2C | IDE | Keypad | LCD | LCD+ | MIDI | Motors | Multitasking | Netmedia | Networking | PCB | PID | PlaySound | PWM | Relays | RTC | Servo | ShiftOut | SitePlayer | SPI | Stack | Timer | USB

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

(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )

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

(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )

--- 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

______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.


(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )

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

(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )