MCX Microcontrollers中的主题 MCXA153 GPIO rise/fall time performance

MCXA153 GPIO rise/fall time performance

seanwu — Wed, 06 Nov 2024 06:05:58 GMT

Dear sir,

In MCXA153 datasheet, the Port rise/fall time for medium I/O pins is like below.

But I measure the Pin GPIO3_6 real rise time, the time value is 45.2ns. It is more slower then spec.

Could you please give me some suggestion?

Thanks.

BR,

Sean Wu.

/////////////////////////////////////////////////////////////////////////////

clock is BOARD_BootClockFRO96M();

In while loop to toggle GPIO3_6.

while (1)

{

delay();

GPIO3->PTOR=GPIO_FIT_REG(64);

}

Re: MCXA153 GPIO rise/fall time performance

xiangjun_rong — Thu, 07 Nov 2024 01:38:45 GMT

Hi,

Pls refer to the test condition under which the GPIO pin(The GPIO pin is configured in output mode ) toggles and is tested the rising/falling time.

The pin parasitic capacitance is required to be 25pF when the GPIO output pin toggles, so I suggest you select a GPIO pin, the GPIO pad(LQFP package) is not connected out, then test it with scope.

Hope it can help you

Xiangjun Rong