topic FRDM-K64F Pinout in Kinetis Microcontrollers

FRDM-K64F Pinout

carlrumsey — Tue, 17 Feb 2015 04:02:44 GMT

I would just like to inform you that I was working with the FRDM-K64F board, Rev C/Rev E to utilize a Wifi chips capabilities. After much debug it was found that the CE pin, AKA PTC12, must be routed incorrectly. A continuity check was done to find that the CE pin on the board was connected to PTB20, which is also used as a row header elsewhere. The CE pin is shown to be PTC12 in all of the documentation. This is pin 66 on the MCU. Since I was not using PTB20 I changed it in the code and it worked. It was just a pain to debug the issue with the hardware. Just something to keep in mind in the future revisions to fix. Since I found this I am wondering where the missing pin, PTC12, is routed on the board. Thank you

Re: FRDM-K64F Pinout

apanecatl — Mon, 23 Feb 2015 17:51:16 GMT

You are correct, J6 CE line is connected to PTB20 instead of PTC12 as depicted in the board's documentation, as for PTC12, it is not hooked to any external connector.

Re: FRDM-K64F Pinout

habiburrahman — Sun, 19 Apr 2015 00:46:48 GMT

I faced a lot of trouble figuring out the problem why my nrf24l01+ was not working. wrote program to blink all the 6 pins individually and, and figured out the CE pin was not working. I wrote the blinky code in mbed but the CE pin failed to output the results i expected. I began doubting the mbed pin definitions, so i wrote the blinky code in keil uvision but pin CE failed to work . I checked for continuity and figured out that pin 64 was not having continuity with CE, but pin 66 (PTB20). I have also noticed no continuity on PINA0. Am i missing any document???

Re: FRDM-K64F Pinout

ve3id — Fri, 14 Feb 2025 21:50:53 GMT

I wish I had seen this earlier, Carl! I just went
through the same rigamarole and ohmed it out to pin 66 also. So the CE pin of the RF header is not PTC12 but PTB20!
However, when I:
PORTB->PCR[20] = 0x103; (Alt 1, GPIO, +PUP)
GPIOB_PDDR |= (0x01 << 20);
and
GPIOB_PSOR |= 0x100000;
it does not set it to HI, in fact I can see it is not driven at all by seeing noise when I touch the probe with my finger.
Can some engineer that is familiar with the design answer if perhaps I should be using other than alt 1? In the spreadsheet the pin is identified as being the SD card present signal!