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NRF52811-QCAA-R Datasheet(PDF) 331 Page - Nordic Semiconductor |
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NRF52811-QCAA-R Datasheet(HTML) 331 Page - Nordic Semiconductor |
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331 / 444 page  Peripherals To generate a repeated start after a read sequence, a second start task must be triggered instead of the STOP task, that is, STARTRX or STARTTX. This start task must be triggered before the last byte is extracted from RXD to ensure that the TWI master sends a NACK back to the slave before generating the repeated start condition. 6.23.7 Low power When putting the system in low power and the peripheral is not needed, lowest possible power consumption is achieved by stopping, and then disabling the peripheral. The STOP task may not be always needed (the peripheral might already be stopped), but if it is sent, software shall wait until the STOPPED event was received as a response before disabling the peripheral through the ENABLE register. 6.23.8 Registers Base address Peripheral Instance Description Configuration 0x40003000 TWI TWI0 Two-wire interface master Deprecated Table 99: Instances Register Offset Description TASKS_STARTRX 0x000 Start TWI receive sequence TASKS_STARTTX 0x008 Start TWI transmit sequence TASKS_STOP 0x014 Stop TWI transaction TASKS_SUSPEND 0x01C Suspend TWI transaction TASKS_RESUME 0x020 Resume TWI transaction EVENTS_STOPPED 0x104 TWI stopped EVENTS_RXDREADY 0x108 TWI RXD byte received EVENTS_TXDSENT 0x11C TWI TXD byte sent EVENTS_ERROR 0x124 TWI error EVENTS_BB 0x138 TWI byte boundary, generated before each byte that is sent or received EVENTS_SUSPENDED 0x148 TWI entered the suspended state SHORTS 0x200 Shortcuts between local events and tasks INTENSET 0x304 Enable interrupt INTENCLR 0x308 Disable interrupt ERRORSRC 0x4C4 Error source ENABLE 0x500 Enable TWI PSEL.SCL 0x508 Pin select for SCL PSEL.SDA 0x50C Pin select for SDA RXD 0x518 RXD register TXD 0x51C TXD register FREQUENCY 0x524 TWI frequency. Accuracy depends on the HFCLK source selected. ADDRESS 0x588 Address used in the TWI transfer Table 100: Register overview 6.23.8.1 TASKS_STARTRX Address offset: 0x000 Start TWI receive sequence 4454_140 v1.0 331 |
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