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'Another BASIC SPI bus question'
1999\10\30@140438 by Jon Petty

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Hi

I have another SPI or microwire bus question.

I am also looking at extending the output pin capabilities of my PIC by using
a 74LS595. I have never used a chip like this before and I would like to use
the SPI bus clock and data lines, that I am using to control an SPI eeprom
and DAC, for the SCK and RCK pins of the 74LS595.

I believe I can use the SI pin like a CS(chip select) Is that correct? It
looks like the data isn't clocked in until the SI line is pulsed.

If I keep the SI line low when I don't want data shifted in, will it ignore
the status of the RCK line as the SPI bus is talking with other chips?

Thanks



Jon


'Another BASIC SPI bus question'
1999\11\02@032820 by Frank Adlam
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Serial PIC'n by RL Stevens
Square1 Electronics
http://www.sq-1.com

>>> Jon Petty <spam_OUTPhxsys3TakeThisOuTspamAOL.COM> 10/30 8:03 PM >>>
Hi

I have another SPI or microwire bus question.

I am also looking at extending the output pin capabilities of my PIC by using
a 74LS595. I have never used a chip like this before and I would like to use
the SPI bus clock and data lines, that I am using to control an SPI eeprom
and DAC, for the SCK and RCK pins of the 74LS595.

I believe I can use the SI pin like a CS(chip select) Is that correct? It
looks like the data isn't clocked in until the SI line is pulsed.

If I keep the SI line low when I don't want data shifted in, will it ignore
the status of the RCK line as the SPI bus is talking with other chips?

Thanks



Jon












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