74HC165 Parallel to Serial

Gaudware

I was wanting to know if any one could tell me how to use this with the propeller chip
Any help will helpful, Thanks in advance.

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sylvie369

You're probably going to have to say what you want it to do. What are you trying to accomplish with it?

Leon

The SPI code in the Object Exchange should work.

Leon

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Gaudware

I look into it thanks

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StefanL38

Hello,

@Leon: are you sure that THIS chip will work with an SPI-object ?

it's NOT specified as an SPI-device with PINs named

SCLK — Serial Clock (output from master)
MOSI/SIMO — Master Output, Slave Input (output from master)
MISO/SOMI — Master Input, Slave Output (output from slave)

I guess that it will NOT work with the SPI-protocol

could you say a explicit YES or NO that a 74HC165 which has
Pins named
PL - asynchronous parallel load input (active LOW)
CP - clock input (LOW-to-HIGH edge-triggered)

@Gaudware:

This is the description in the datasheet how the bits are transferred
from the chip to the serial output

When the parallel load
(PL) input is LOW, parallel data from the D0 to
D7 inputs are loaded into the register asynchronously.
When PL is HIGH, data enters the register serially at the
Ds input and shifts one place to the right
(Q0 ® Q1 ® Q2, etc.) with each positive-going clock
transition. This feature allows parallel-to-serial converter
expansion by tying the Q7 output to the DS input of the
succeeding stage.
The clock input is a gated-OR structure which allows one
input to be used as an active LOW clock enable (CE) input.
The pin assignment for the CP and CE inputs is arbitrary
and can be reversed for layout convenience. The
LOW-to-HIGH transition of input CE should only take
place while CP HIGH for predictable operation. Either the
CP or the CE should be HIGH before the
LOW-to-HIGH transition of PL to prevent shifting the data
when PL is activated.

As the datasheet has charateristics listed for Vcc = 2V it MIGHT work at 3.3V but I#m not sure

there are other CMOS-chips that explicit work properly with a supply-voltage of 2.8V - 5V

and for the 74HC597 which has the same functionality as the 74HC165 there already exists an object in the obex

best regards

Stefan

Mike Green

The 74HC165 should work just fine with a Propeller. The easiest way to use it would be with the BS2 Compatibility Library from the Object Exchange and using the SHIFTIN method. The 74HC165 is not described as an SPI chip, but it uses that protocol in that there's a chip select (clock enable) and the data is shifted out serially under control of a clock (in this case on the leading positive edge).

Gaudware

Thanks for the Input I am going to use the BS2 Functions object and look at some code in stamps works book for coding purposes

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Leon

StefanL38 said...
Hello,

@Leon: are you sure that THIS chip will work with an SPI-object ?

it's NOT specified as an SPI-device with PINs named

SCLK — Serial Clock (output from master)
MOSI/SIMO — Master Output, Slave Input (output from master)
MISO/SOMI — Master Input, Slave Output (output from slave)

I guess that it will NOT work with the SPI-protocol


Stefan

I think it's similar in operation to the 74HC595 (ser-par), which is definitely an SPI device.

Leon

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Amateur radio callsign: G1HSM
Suzuki SV1000S motorcycle