UARTE TXD.MAXCNT only 8 bits in nRF52840 ?

[Christian Prasch]

Hello,

i am working on a nRF52840-Preview-DK with SDK 15.

When sending data out on UARTE1 with function nrfx_uarte_tx(..) everything works as expected but only with data length parameter up to 255. I have also tried to write 0x1FF directly to the TXD.MAXCNT register of UARTE0 and UARTE1 and the read back value is 0xFF.

Is the TXD.MAXCNT register only 8 bits instead of the documented 16 bits (nRF52840_PS_v1.0.pdf) ?

TIA

Christian

[Jørgen Holmefjord]

Hi,

This depends on which revison of the nRF52840 IC you have. Please see errata 131 for nRF52840 Engineering A revision.

Best regards,
Jørgen