Debug console LPUART1 Pulll-Down config

[Seongyon_Jeong]

Hi.     

RT1020 is used

It` simple question. but, I didn`t understand  below.

In general  SDK Example, 

LPUART1 is used as debug console, 

Its configuration is

  IOMUXC_SetPinConfig(IOMUXC_GPIO_AD_B0_07_LPUART1_RX, 0x10B0U);

  IOMUXC_SetPinConfig(IOMUXC_GPIO_AD_B0_06_LPUART1_TX, 0x10B0U);

      0x10B0U   ==>  100KOhm Pull Down 

But ,  Generally ,   Is Pull-up  Registance  used ??

     also, In schemetics of RT1020 EVk  ,  I can see  pull-up  registance 

Why   pull-down configuration is declared ??

[Seongyon_Jeong]

My question is,

Why  100kohm Pull down  configuration setting is  inserted  for LPUART in  SDK EXAMPLE ?? 

You mean, 

100Kohm Pull down  registance (in  IOMUXC pin configuration) is  internal registance  inside CORE-(MCU) ,

and It is  USED for pull down strength,       

Because,   externally  10KOhm  Pull-up  Registance   is Connected Outside CORE-(MCU)

Is it Right ?  Your meaning ???

[Kan_Li · Accepted solution]

Hi @Seongyon_Jeong ,

Yes, Generally ,   Pull-up is used, here I think it is used for better pull down strength since external pull up has been used.

Have a great day,
Kan

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