topic Re: baudrate in MCX Microcontrollers

baudrate

syedhashmiraza — Tue, 31 Dec 2024 12:08:47 GMT

hello, iam using mcxa153 mcu in this mcu what is the alternate of

(BRG; /**< Baud Rate Generator register. 16-bit integer baud rate divisor value)

this is not there in mcxa153 mcu how i can implement BRG?

Re: baudrate

Alice_Yang — Thu, 02 Jan 2025 09:22:59 GMT

In MCXA153, the division rate for the baud rate generator register is SBR, as described in 39.6.6 Baud Rate (BAUD). Please note that there may be a difference between SBR and BRG. In MCXA153, the baud rate is calculated as baud clock ÷ ((OSR + 1) × SBR). There is no need to add 1 to SBR. For details, please refer to the User Manual (UM).

Hope it helps you.

Alice

Re: baudrate

syedhashmiraza — Mon, 06 Jan 2025 06:23:00 GMT

hello, how can i write in this method?

void ISO7816_SetETU(uint16_t etu) {

currentETU = etu;

USART1->BRG = (CARD_CLK_DIV * etu) / 16 - 1;

}

Re: baudrate

Alice_Yang — Mon, 06 Jan 2025 10:43:49 GMT

Hello @syedhashmiraza

For MCXA153, the formula for the Uart baud rate is as follows:

baud rate = baud clock ÷ ((OSR + 1) × SBR)

I don't know the meaning about "CARD_CLK_DIV * etu" in your formula.

Alice