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NRF52820-QDAA-R Datasheet(PDF) 329 Page - Nordic Semiconductor |
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NRF52820-QDAA-R Datasheet(HTML) 329 Page - Nordic Semiconductor |
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329 / 437 page  Peripherals 6.23.6 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. 6.23.7 Slave mode pin configuration The SCL and SDA signals associated with the TWI slave are mapped to physical pins according to the configuration specified in the PSEL.SCL and PSEL.SDA registers respectively. The PSEL.SCL and PSEL.SDA registers and their configurations are only used as long as the TWI slave is enabled, and retained only as long as the device is in ON mode. When the peripheral is disabled, the pins will behave as regular GPIOs, and use the configuration in their respective OUT bit field and PIN_CNF[n] register. PSEL.SCL and PSEL.SDA must only be configured when the TWI slave is disabled. To secure correct signal levels on the pins used by the TWI slave when the system is in OFF mode, and when the TWI slave is disabled, these pins must be configured in the GPIO peripheral as described in the following table. Only one peripheral can be assigned to drive a particular GPIO pin at a time. Failing to do so may result in unpredictable behavior. TWI slave signal TWI slave pin Direction Output value Drive strength SCL As specified in PSEL.SCL Input Not applicable S0D1 SDA As specified in PSEL.SDA Input Not applicable S0D1 Table 99: GPIO configuration before enabling peripheral 6.23.8 Registers Base address Peripheral Instance Description Configuration 0x40003000 TWIS TWIS0 Two-wire interface slave 0 0x40004000 TWIS TWIS1 Two-wire interface slave 1 Table 100: Instances Register Offset Description TASKS_STOP 0x014 Stop TWI transaction TASKS_SUSPEND 0x01C Suspend TWI transaction TASKS_RESUME 0x020 Resume TWI transaction TASKS_PREPARERX 0x030 Prepare the TWI slave to respond to a write command TASKS_PREPARETX 0x034 Prepare the TWI slave to respond to a read command EVENTS_STOPPED 0x104 TWI stopped EVENTS_ERROR 0x124 TWI error EVENTS_RXSTARTED 0x14C Receive sequence started EVENTS_TXSTARTED 0x150 Transmit sequence started EVENTS_WRITE 0x164 Write command received EVENTS_READ 0x168 Read command received SHORTS 0x200 Shortcuts between local events and tasks INTEN 0x300 Enable or disable interrupt INTENSET 0x304 Enable interrupt INTENCLR 0x308 Disable interrupt 4463_156 v1.0 329 |
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