Arduino MKR ZERO + MKR ETH, occupied IO?

Official Hardware MKR Family MKR Shields
1

Hi,

I will use Arduino MKR ZERO + Arduino MKR ETH.
Is there any of D0-D21 pins i cannot use as input/output for other items, for the reason that MKR ETH occupy them ?

BR Goran Runquist

2

What did you discover when you consulted the schematic for the MKR ETH?

3

4 SD CS Reserved
5 ETH CS
8 MOSI Reserved
9 SCK Reserved
10 MISO Reserved

But i will just be confirmed that pin 4, 8, 9, 10 is occupied and not useable.
And i wonder if pin 8 is useable?

BR Goran Runquist

4

Sorry, i ment if pin 5 is useable?

5

As far as I can see, you can't use pin 5 (the ethernet chip select signal), even if your sketch isn't using ethernet.

There's the possibility that you could end up with a conflict on the SPI bus if you were trying to talk to the SD card and the ETH CS pin happened to be in the correct state to enable the ethernet chip, as both devices may try to respond at the same time.

6

OK,

Thanks for Your answer, Markd833. I will then not use this five pins for other things (in/out).
(I will use LAN, I do not intend to use SDcard).

BR Goran Runquist

7

you can use pin 4 if you don't insert an SD card into the holder

8

Thanks Juray!

9

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