Communication between TWIM and TWIS with clock stretching

[loquat]

For Errata 149 on nRF52832 , TWIM send  illegal pulse after clock stretching.

When using TWIS as slave device and TWIS require clock stretching,

Do they work correctly?

or

Does TWIM's errata cause TWIS to behave incorrectly?

[Edvin]

Hello,

That errata is related to the TWIM generating this clock pulse after the slave has used clock stretching. So this errata should not affect you when you are running as a TWI slave.

Best regards,

Edvin

[loquat]

it's not.

Will clock-stretch affect me when I connect TWIM to TWIS on another device?

[Edvin]

Ah, I see. So you will use the nRF on both sides. 

I think this will work when you have the nRF52832 as the TWIS as well. Have you tested this?

BR,

Edvin 

[loquat]

Written on Errata 149:
The slave may give an error condition due to a too long or too short clock pulse or the pulse may be lost.
400 kHz
• Minimum: 0.7 μs
• Maximum: 3.0 μs
100 kHz
• Minimum: 0.7 μs
• Maximum: 11.0 μ

Do short / or long pulses affect TWIS?

(As far as I've tested, I haven't had any issues.)

[Edvin]

loquat said:

Do short / or long pulses affect TWIS?

That depends on the TWI slave, and how they interpret the signals. I don't think it should be an issue when the nRF Is used as the TWIS.