NRF52820-QDAA-R datasheet(263/437 Pages) NORDIC

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Peripherals

Symbol

Description

Min.

Typ.

Max.

Units

tSPIM,START

Time from START task to transmission started

µs

tSPIM,CSCK

SCK period

125

tSPIM,RSCK,LD

SCK rise time, standard drive 23

tRF,25pF

tSPIM,RSCK,HD

SCK rise time, high drive23

tHRF,25pF

tSPIM,FSCK,LD

SCK fall time, standard drive23

tRF,25pF

tSPIM,FSCK,HD

SCK fall time, high drive23

tHRF,25pF

tSPIM,WHSCK

SCK high time23

(tCSCK/2)

– tRSCK

tSPIM,WLSCK

SCK low time23

(tCSCK/2)

– tFSCK

tSPIM,SUMI

MISO to CLK edge setup time

tSPIM,HMI

CLK edge to MISO hold time

tSPIM,VMO

CLK edge to MOSI valid, SCK frequency ≤ 8 MHz

tSPIM,VMO,HS

CLK edge to MOSI valid, SCK frequency > 8 MHz

tSPIM,HMO

MOSI hold time after CLK edge

tHMO

MSb

LSb

MSb

LSb

MOSI (out)

MISO (in)

CPOL=0

CPHA=0

tSUMI

tHMI

tRSCK

tFSCK

tCSCK

tWHSCK

tWLSCK

tVMO

CPOL=1

CPHA=0

CPOL=0

CPHA=1

CPOL=1

CPHA=1

Figure 101: SPIM timing diagram

6.17 SPIS — Serial peripheral interface slave with

EasyDMA

SPI slave (SPIS) is implemented with EasyDMA support for ultra-low power serial communication from an

external SPI master. EasyDMA, in conjunction with hardware-based semaphore mechanisms, removes all

real-time requirements associated with controlling the SPI slave from a low priority CPU execution context.

23 At 25 pF load, including GPIO pin capacitance, see GPIO electrical specification.

4463_156 v1.0

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