Giuseppe coviello

MISO and MOSI short circuit with a diode. - MC9S08GB60

Discussion created by Giuseppe coviello on Jul 1, 2008
Latest reply on Jul 2, 2008 by bigmac

I have to interface a MC9S08GB60 to a ADF7021. The ADF7021 has only one pin for the TxRxDATA and one pin for the TxRxClock that specify the data rate. I would like to use the SPI interface of the uC. Could I short circuit the MISO and MOSI pin of the uC and use it as a slave? When the ADF is in transmit mode TxRxData is an input while when it is in receive mode, the TxRxData is an output.
Analog Device suggest


uC ADF7020
| /|
MISO--->|/ |-------- TxRxData
|\ | |
| \| |
|
|
|
MOSI-----------

SCLOCK--------------TxRxClock

do you think it could be work?

thank you in advance

The paint is not clear due to formatting.
if you want, you could see on page 46 of http://www.analog.com/static/imported-files/data_sheets/ADF7021.pdf
don't see SPI mode because there are other problems with the datarata.

If I can't insert extern link, excuse me.



Update: could I use SISO?
Message Edited by covibryant81 on 2008-07-01 07:04 PM

Message Edited by covibryant81 on 2008-07-01 07:10 PM

 

 

Added p/n to subject.



Message Edited by NLFSJ on 2008-07-01 01:13 PM

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