What is the UART default parity configuration

[Torsten Robitzki]

Hello,

I'm currently reading nRF51_Series_Reference_Manual_v2.1.pdf. On page 28.9.9 there is the UART CONFIG register documented. Two bits of configuration for the Parity (ID B), where the value 0x0 denotes no parity and 0x7 even parity (as far as I read it together with 28.8: "When parity is enabled, the parity will be generated automatically from the even parity of TXD and RXD for transmission and reception respectively."). 0x7 is a 3 bit value.

According to 28.9.9 the reset Value of the configuration is 0x2.

Sounds wierd, isn't it? Is 0x7 just a typo and must be read as 0x2? 2 bits to encode 2 different configurations?

kind regards, Torsten

[Paul]

Hi Torsten

It should be 3 bit ,and 0x0 for excluded, and 0x7 for included. Manual V3.0 fixed this error.

The nrf51_bitfields.h is also correct :-)

/* Bits 3..1 : Include parity bit. */
#define UART_CONFIG_PARITY_Pos (1UL) /*!< Position of PARITY field. */
#define UART_CONFIG_PARITY_Msk (0x7UL << UART_CONFIG_PARITY_Pos) /*!< Bit mask of PARITY field. */
#define UART_CONFIG_PARITY_Excluded (0UL) /*!< Parity bit excluded. */
#define UART_CONFIG_PARITY_Included (7UL) /*!< Parity bit included. */

[Torsten Robitzki]

I've downloaded Version 3.0. Thank you now this makes sense ;-) And 0x0 beeing the default.