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NRF52811-QCAA-R Datasheet(PDF) 293 Page - Nordic Semiconductor |
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NRF52811-QCAA-R Datasheet(HTML) 293 Page - Nordic Semiconductor |
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293 / 444 page  Peripherals 6.19.3 EasyDMA The SPIM implements EasyDMA for accessing RAM without CPU involvement. The SPIM peripheral implements the following EasyDMA channels: Channel Type Register Cluster TXD READER TXD RXD WRITER RXD Table 87: SPIM EasyDMA Channels For detailed information regarding the use of EasyDMA, see EasyDMA on page 35. The .PTR and .MAXCNT registers are double-buffered. They can be updated and prepared for the next transmission immediately after having received the STARTED event. The SPI master will automatically stop transmitting after TXD.MAXCNT bytes have been transmitted and RXD.MAXCNT bytes have been received. If RXD.MAXCNT is larger than TXD.MAXCNT, the remaining transmitted bytes will contain the value defined in the ORC register. If TXD.MAXCNT is larger than RXD.MAXCNT, the superfluous received bytes will be discarded. The ENDRX/ENDTX event indicate that EasyDMA has finished accessing respectively the RX/TX buffer in RAM. The END event gets generated when both RX and TX are finished accessing the buffers in RAM. In the case of bus congestion as described in , data loss may occur. 6.19.4 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. 6.19.5 Registers Base address Peripheral Instance Description Configuration 0x40003000 SPIM SPIM1 SPI master 1 0x40004000 SPIM SPIM0 SPI master 0 Table 88: Instances Register Offset Description TASKS_START 0x010 Start SPI transaction TASKS_STOP 0x014 Stop SPI transaction TASKS_SUSPEND 0x01C Suspend SPI transaction TASKS_RESUME 0x020 Resume SPI transaction EVENTS_STOPPED 0x104 SPI transaction has stopped EVENTS_ENDRX 0x110 End of RXD buffer reached EVENTS_END 0x118 End of RXD buffer and TXD buffer reached EVENTS_ENDTX 0x120 End of TXD buffer reached EVENTS_STARTED 0x14C Transaction started SHORTS 0x200 Shortcuts between local events and tasks 4454_140 v1.0 293 |
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