15.15.1 Digital Interface Timing Characteristics

Note: This is for internal communication between the AT86RF212B transceiver and the SAM L21 microcontroller.

Test Conditions: T_OP = +25°C, V_DD = 3.0V, C_Load = 50pF (unless otherwise stated).


Symbol	Parameter	Condition	Min.	Typ.	Max.	Unit
f_sync	SCLK frequency	Synchronous operation			8	MHz
f_async	SCLK frequency	Asynchronous operation			7.5	MHz
t₁	/SEL falling edge to MISO active				180	ns
t₂	SCLK falling edge to MISO out	Data hold time	25			ns
t₃	MOSI setup time		10			ns
t₄	MOSI hold time		10			ns
t₅	LSB last byte to MSB next byte		250⁽¹⁾			ns
t₆	/SEL rising edge to MISO tri state				10	ns
t₇	SLP_TR pulse width	TX start trigger	62.5		Note⁽²⁾	ns
t₈	SPI idle time: SEL rising to falling edge	SPI read/write, standard SRAM and frame access modes Idle time between consecutive SPI accesses	250			ns
t_8a	SPI idle time: SEL rising to falling edge	Fast SRAM read/write access mode Idle time between consecutive SPI accesses	500			ns
t₉	SCLK rising edge LSB to /SEL rising edge			250		ns
t₁₀	Reset pulse width	≥ 10 clock cycles at 16MHz	625			ns
t₁₁	SPI access latency after reset	≥ 10 clock cycles at 16MHz	625			ns
t₁₂	Dynamic frame buffer protection: IRQ latency			750		ns
t_IRQ	IRQ_2, IRQ_3, IRQ_4 latency	Relative to the event to be indicated		9		µs
f_CLKM	Output clock frequency at pin 17 (CLKM)	Configurable by the CLKM_CTRL bits in the TRX_CTRL 0 register (TRX_CTRL_0.CLKM_CTRL) CLKM_CTRL = 0		0		MHz
		CLKM_CTRL = 1		1		MHz
		CLKM_CTRL = 2		2		MHz
		CLKM_CTRL = 3		4		MHz
		CLKM_CTRL = 4		8		MHz
		CLKM_CTRL = 5		16		MHz
		CLKM_CTRL = 6		250		kHz
		CLKM_CTRL = 7⁽³⁾		20.0		kHz
		CLKM_CTRL = 7⁽⁴⁾		40.0		kHz
		CLKM_CTRL = 7⁽⁵⁾		25.0		kHz
		CLKM_CTRL = 7⁽⁶⁾		62.5		kHz

For Fast SRAM read/write accesses on address space 0x82 – 0x94 the time t₅(Min.) and t₈(Min.) increases to 500ns.
Maximum pulse width less than (TX frame length + 16µs).
1/50MHz; Only in BPSK mode with fPSDU = 20kb/s.
1/25MHz; Only in BPSK mode with fPSDU = 40kb/s.
1/40MHz; Only in O-QPSK mode with fPSDU = 100/200/400kb/s.
1/16MHz; Only in O-QPSK mode with fPSDU = 250/500/1000kb/s.