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NRF9160-SICA-R7 Datasheet(PDF) 313 Page - Nordic Semiconductor |
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NRF9160-SICA-R7 Datasheet(HTML) 313 Page - Nordic Semiconductor |
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313 / 400 page  Peripherals Symbol Type Description ENABLE Register The TWI slave has been enabled via the ENABLE register. PREPARETX Task The TASKS_PREPARETX task has been triggered. STOP Task The TASKS_STOP task has been triggered. PREPARERX Task The TASKS_PREPARERX task has been triggered. STOPPED Event The EVENTS_STOPPED event was generated. RXSTARTED Event The EVENTS_RXSTARTED event was generated. TXSTARTED Event The EVENTS_TXSTARTED event was generated. TX prepared Internal Internal flag indicating that a TASKS_PREPARETX task has been triggered. This flag is not visible to the user. RX prepared Internal Internal flag indicating that a TASKS_PREPARERX task has been triggered. This flag is not visible to the user. Unprepare TX Internal Clears the internal 'TX prepared' flag until next TASKS_PREPARETX task. Unprepare RX Internal Clears the internal 'RX prepared' flag until next TASKS_PREPARERX task. Stop condition TWI protocol A TWI stop condition was detected. Restart condition TWI protocol A TWI restart condition was detected. Table 93: TWI slave state machine symbols The TWI slave can perform clock stretching, with the premise that the master is able to support it. The TWI slave operates in a low power mode while waiting for a TWI master to initiate a transfer. As long as the TWI slave is not addressed, it will remain in this low power mode. To secure correct behavior of the TWI slave, PSEL.SCL, PSEL.SDA, CONFIG, and the ADDRESS[n] registers must be configured prior to enabling the TWI slave through the ENABLE register. Similarly, changing these settings must be performed while the TWI slave is disabled. Failing to do so may result in unpredictable behavior. 6.18.1 Shared resources The TWI slave shares registers and other resources with other peripherals that have the same ID as the TWI slave. Therefore, you must disable all peripherals that have the same ID as the TWI slave before the TWI slave can be configured and used. Disabling a peripheral that has the same ID as the TWI slave will not reset any of the registers that are shared with the TWI slave. It is therefore important to configure all relevant registers explicitly to secure that the TWI slave operates correctly. The Instantiation table in Instantiation on page 24 shows which peripherals have the same ID as the TWI slave. 6.18.2 EasyDMA The TWIS implements EasyDMA for accessing RAM without CPU involvement. The following table shows the Easy DMA channels that the TWIS peripheral implements. Channel Type Register Cluster TXD READER TXD RXD WRITER RXD Table 94: TWIS EasyDMA Channels For detailed information regarding the use of EasyDMA, see EasyDMA on page 45. The STOPPED event indicates that EasyDMA has finished accessing the buffer in RAM. 4418_1315 v2.0 313 |
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