Multiplexing code

Archiver

Hello, i want to multiplex 8 bit to 4 bit using the IC74157.

Archiver

Hello, how can i multiplex 8 bit to 4 bit using the IC74157? please i
need the code.

Archiver

are you wanting a serial interface for 8 bits because you don't want
to use the 8 pins of the stamp what are you wanting changing 8 bits to
4 bits help me here

Kalun Lau wrote:
>
> Hello, how can i multiplex 8 bit to 4 bit using the IC74157? please i
> need the code.

Archiver

The 74165 should give you 8 bit input using only three lines to the
stamp and there should be code for this

Can anyone send the 74165 code Ill keep looking

Kalun Lau wrote:
>
> Hello LarryGaminde,
>
> i hace a Voicedirect 364 speech recognition module and i want to use
> the stamp as a "time control" because the speech rec. has 1 sec high
> in its 8 bits output. i want to extend and control that time using the
> stamp 2
>
> Wednesday, December 13, 2000, 9:22:14 PM, you wrote:
>
> L> are you wanting a serial interface for 8 bits because you don't want
> L> to use the 8 pins of the stamp what are you wanting changing 8 bits to
> L> 4 bits help me here
>
> Best regards,
> Kalun mailto:klnlau@v...

Archiver

This program was done by jon williams for nuts and volts in Sept. of
1998

I hope this helps



' Listing 1

' Stamp Applications: Nuts & Volts, September 1998



'

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[noparse][[/noparse] Title
]

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'

' File...... DIGIO.BAS

' Purpose... 74HC165/74HC595 Demo

' Author.... Jon Williams

' E-mail.... jonwms@a...

' WWW....... http://members.aol.com/jonwms

' Started... 02 AUG 98

' Updated... 02 AUG 98





'

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[noparse][[/noparse] Program Description
]

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'

' Demonstrates digital I/O expansion using readily available shift

' registers.





'

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[noparse][[/noparse] Revision History
]

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'

' 02 AUG 98 : Rev 1 complete





'

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[noparse][[/noparse] Constants
]

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'

SYMBOL Clk = 0 ' clock

SYMBOL DPin = 1 ' data pin

SYMBOL Data = Pin1 ' data bit

SYMBOL _165 = 6 ' HC165 strobe

SYMBOL _595 = 7 ' HC595 strobe





'

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[noparse][[/noparse] Variables
]

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'

SYMBOL temp = B0 ' using for shift in/out

SYMBOL shift = B2 ' shift counter





'

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[noparse][[/noparse] EEPROM Data
]

---

'





'

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[noparse][[/noparse] Initialization
]

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'

Init: Pins = %11000000 ' _595 & _165 = H, Clk = L

Dirs = %11000001





'

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[noparse][[/noparse] Main Code
]

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'

Main: GOSUB DigIn ' get HC165 inputs

DEBUG #%temp,cr ' display

PAUSE 100

GOTO Main

END





'

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[noparse][[/noparse] Subroutines
]

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'



DigIn: PULSOUT _165, 5 ' load the inputs

INPUT DPin ' prepare for data in

FOR shift = 1 TO 8 ' shift 8 bits

temp = temp * 2 ' rotate left (MSB first)

Bit0 = Data ' get a bit

PULSOUT Clk, 5 ' clock out the next bit

NEXT

RETURN





DigOut: OUTPUT DPin ' prepare for data out

FOR shift = 1 TO 8 ' shift 8 bits

Data = Bit7 ' MSB first

PULSOUT Clk, 5 ' clock the bit

temp = temp * 2 ' get next bit

NEXT

PULSOUT _595, 5 ' bits -> outputs

RETURN





Kalun Lau wrote:
>
> Hello LarryGaminde,
>
> i hace a Voicedirect 364 speech recognition module and i want to use
> the stamp as a "time control" because the speech rec. has 1 sec high
> in its 8 bits output. i want to extend and control that time using the
> stamp 2
>
> Wednesday, December 13, 2000, 9:22:14 PM, you wrote:
>
> L> are you wanting a serial interface for 8 bits because you don't want
> L> to use the 8 pins of the stamp what are you wanting changing 8 bits to
> L> 4 bits help me here
>
> Best regards,
> Kalun mailto:klnlau@v...