MKV46F256VLH16 - SPI0_SOUT on PIN 51/PTC6 - Cip MASK 1N72K

[Kubiznak]

Good day,

when debugging communication with SPI EEPROM, there is no data on Pin51/PTC6 in the ALT2 setting (SPI0_SOUT). The pin is permanently low. After porting to Pin63/PTD6 in the ALT7 setting, the data is output correctly. Is there another way to activate the data output on Pin51/PTC6 or does this pin not actually have this functionality?

Thank you

--
Jaromir Kubiznak

Dobrý den,

při ladění komunikace s SPI EEPROM nejsou na Pinu51/PTC6 v nastavení ALT2 (SPI0_SOUT) data. Pin je trvale v nízké úrovni. Po přeportování na Pin63/PTD6 v nastaveni ALT7 data vystupují správně. Je cesta jak jinak aktivovat výstup dat na Pinu51/PTC6 nebo tento pin ve skutečnosti tuto funkcionalitu nemá?

Děkuji

-- 
Jaromir Kubiznak

[Robin_Shen]

Hi Jaromir Kubiznak,

PTC6 and PTC7 have true open-drain outputs thus when enabled as outputs, an external pull-resistor is required if output is logic 1.(You can find the information in KV4XP100M168RM Kinetis KV4x: 168 MHz Arm^® Cortex^®-M4 up to 256KB Flash (100pin))

Best Regards,
Robin
-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!

- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
-------------------------------------------------------------------------------

[Kubiznak]

Hi Robin,

thank you very much for your help. After installing the Pull Up resistors the SPI finally started working properly.

Jaromir

[Robin_Shen]

You are welcome!
I am glad to hear that it works now.

[Kubiznak]

Hi Robin,

thanks for the link to Keil. We use IAR and the source files are the same. Unfortunately, I overlooked that PTC6 and PTC7 are open collector in ALT2, which I didn't expect for fast SPI communication. We looked for a bug in the driver and suspected a chip bug. Pull Up resistors explain everything. Thanks again.

Best regards,

Jaromir