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NRF52811-QCAA-R7 Datasheet(PDF) 327 Page - Nordic Semiconductor

Part # NRF52811-QCAA-R7
Description  nRF52811
PDF  444 Pages
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Manufacturer  NORDIC [Nordic Semiconductor]
Direct Link  https://www.nordicsemi.com/
Logo NORDIC - Nordic Semiconductor

NRF52811-QCAA-R7 Datasheet(HTML) 327 Page - Nordic Semiconductor

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Peripherals
6.23 TWI — I2C compatible two-wire interface
The TWI master is compatible with I2C operating at 100 kHz and 400 kHz.
TXD
(signal)
RXD
TXD
PSEL.SDA
PSEL.SCL
PSEL.SDA
RXD
(signal)
ERROR
STOP
STARTTX
STARTRX
STOPPED
RXDRDY
TXDSENT
BB
SUSPEND
RESUME
SUSPENDED
Figure 122: TWI master's main features
6.23.1 Functional description
This TWI master is not compatible with CBUS. The TWI transmitter and receiver are single buffered.
See, TWI master's main features on page 327.
A TWI setup comprising one master and three slaves is illustrated in A typical TWI setup comprising one
master and three slaves on page 327. This TWI master is only able to operate as the only master on the
TWI bus.
TWI master
TWI slave
(Sensor)
Address = b1011000
TWI slave
Address = b1011011
SCL
SCL
TWI slave
(EEPROM)
Address = b1011001
SCL
R
VDD
R
VDD
SDA
SDA
SDA
SCL
SDA
Figure 123: A typical TWI setup comprising one master and three slaves
This TWI master supports clock stretching performed by the slaves. The TWI master is started by triggering
the STARTTX or STARTRX tasks, and stopped by triggering the STOP task.
If a NACK is clocked in from the slave, the TWI master will generate an ERROR event.
6.23.2 Master mode pin configuration
The different signals SCL and SDA associated with the TWI master are mapped to physical pins according to
the configuration specified in the PSEL.SCL and PSEL.SDA registers respectively.
If the CONNECT field of a PSEL.xxx register is set to Disconnected, the associated TWI signal is not
connected to any physical pin. The PSEL.SCL and PSEL.SDA registers and their configurations are only used
4454_140 v1.0
327



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