NRF52810-QFAA-R datasheet(414/483 Pages) NORDIC

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Peripherals

The TWI master is stopped by triggering the STOP task, this task must be triggered before the NACK bit is

supposed to be transmitted. The STOP task can be triggered at any time during the reception of the last

byte. It is safe to use the shortcut between LASTRX and STOP to accomplish this.

Note that the TWI master does not stop by itself when the RAM buffer is full, or when an error occurs. The

STOP task must be issued, through the use of a local or PPI shortcut, or in software as part of the error

handler.

The TWI master cannot get stopped while it is suspended, so the STOP task has to be issued after the TWI

master has been resumed.

ADDR

M-1

Stretch

Figure 109: The TWI master reading data from a slave

6.23.4 Master repeated start sequence

A typical repeated start sequence is one in which the TWI master writes two bytes to the slave followed by

reading four bytes from the slave. This example uses shortcuts to perform the simplest type of repeated

start sequence, i.e. one write followed by one read. The same approach can be used to perform a

repeated start sequence where the sequence is read followed by write.

The figure A repeated start sequence, where the TWI master writes two bytes followed by reading 4 bytes

from the slave on page 414 illustrates this:

ADDR

Figure 110: A repeated start sequence, where the TWI master

writes two bytes followed by reading 4 bytes from the slave

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