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NRF52811-QCAA-R Datasheet(PDF) 169 Page - Nordic Semiconductor |
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NRF52811-QCAA-R Datasheet(HTML) 169 Page - Nordic Semiconductor |
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169 / 444 page  Peripherals 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. To secure correct behavior in the QDEC, the pins used by the QDEC must be configured in the GPIO peripheral as described in GPIO configuration before enabling peripheral on page 169 before enabling the QDEC. This configuration must be retained in the GPIO for the selected IOs as long as the QDEC is enabled. Only one peripheral can be assigned to drive a particular GPIO pin at a time. Failing to do so may result in unpredictable behavior. QDEC signal QDEC pin Direction Output value Comment Phase A As specified in PSEL.A Input Not applicable Phase B As specified in PSEL.B Input Not applicable LED As specified in PSEL.LED Input Not applicable Table 56: GPIO configuration before enabling peripheral 6.13.7 Registers Base address Peripheral Instance Description Configuration 0x40012000 QDEC QDEC Quadrature decoder Table 57: Instances Register Offset Description TASKS_START 0x000 Task starting the quadrature decoder TASKS_STOP 0x004 Task stopping the quadrature decoder TASKS_READCLRACC 0x008 Read and clear ACC and ACCDBL TASKS_RDCLRACC 0x00C Read and clear ACC TASKS_RDCLRDBL 0x010 Read and clear ACCDBL EVENTS_SAMPLERDY 0x100 Event being generated for every new sample value written to the SAMPLE register EVENTS_REPORTRDY 0x104 Non-null report ready EVENTS_ACCOF 0x108 ACC or ACCDBL register overflow EVENTS_DBLRDY 0x10C Double displacement(s) detected EVENTS_STOPPED 0x110 QDEC has been stopped SHORTS 0x200 Shortcuts between local events and tasks INTENSET 0x304 Enable interrupt INTENCLR 0x308 Disable interrupt ENABLE 0x500 Enable the quadrature decoder LEDPOL 0x504 LED output pin polarity SAMPLEPER 0x508 Sample period SAMPLE 0x50C Motion sample value REPORTPER 0x510 Number of samples to be taken before REPORTRDY and DBLRDY events can be generated ACC 0x514 Register accumulating the valid transitions ACCREAD 0x518 Snapshot of the ACC register, updated by the READCLRACC or RDCLRACC task PSEL.LED 0x51C Pin select for LED signal PSEL.A 0x520 Pin select for A signal PSEL.B 0x524 Pin select for B signal DBFEN 0x528 Enable input debounce filters LEDPRE 0x540 Time period the LED is switched ON prior to sampling ACCDBL 0x544 Register accumulating the number of detected double transitions 4454_140 v1.0 169 |
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