Where is i.MX RT1021DAF/1015DAF GPT clock input?

[Alex_Tsai]

RT1021DAF or RT1015DAF has GPT clock input？

The Table 46-2 GPT External Signals seems wrong in reference manual page.2442.

[victorjimenez]

Hello Alex, 

There isn't any error with Table 46-2. The GPT counter can be operated using an external clock from outside the device, and this is the input pin used for that purpose. The external clock input (GPT_CLK) is treated as asynchronous to the peripheral clock (ipg_clk). To ensure proper operations of GPT, the external clock input frequency should be less than 1/4 of frequency of the peripheral clock (ipg_clk). Hysteresis characteristics on this pad will be required because this is a clock input.

Have a great day,
Victor

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[Alex_Tsai]

Refer to the following table of RT1021.

Actually, the GPT1_CLK Pad is GPIO_EMC_39, not GPIO_AD_B0_13.

The GPIO_AD_B0_13 Pad is for RT105x.

And, both GPIO_EMC_39(GPT1_CLK) & GPIO_EMC_31(GPT2_CLK) not in RT1021DAF(100pin).

So 100pin package no anyone GPT_CLK input, right?

[victorjimenez]

Hi Alex, 

Thanks for clarifying. You are right, there is a problem with Table 46-2, thanks for catching this! I will report it with the documentation team so they can fix it on future releases of the RM. 

Regarding the RT1021DAF(100pin), I'm checking with the design team what would be the case for the 100 pin package. 

Victor 

[victorjimenez]

Hi Alex, 

14 x 14 mm, 0.5 mm pitch doesn't have  GPIO_EMC_31 and  GPIO_EMC_39, so GPTx_CLK is not available on the 100 PIN package.

Regards,

Victor