45.13.1 SERCOM in SPI Mode Timing

Table 45-59. SPI Timing Characteristics and Requirements ⁽¹⁾

Symbol	Parameter	Conditions		Min.	Typ.	Max.	Units
tSCK(10)	SCK period	Host	Reception	2*(tMIS+tCLIENT_OUT) (3)	-	-	ns
		Host	Transmission	2*(tMOV+tCLIENT_IN) (4)	-	-
tSCKW	SCK high/low width	Host		-	0.5*tSCK	-	ns
tSCKR	SCK rise time (2)	Host		-	0.25*tSCK	-	ns
tSCKF	SCK fall time (2)	Host		-	0.25*tSCK	-	ns
tMIS	MISO setup to SCK	Host, VDD>4.5V		50.7	-	-	ns
		Host, VDD>2.7V		60.6	-	-
tMIH	MISO hold after SCK	Host, VDD>4.5V		0	-	-	ns
		Host, VDD>2.7V		0	-	-
tMOV	MOSI output valid SCK	Host, VDD>4.5V		-	-	17.1	ns
		Host, VDD>2.7V		-	-	23.6
tMOH	MOSI hold after SCK	Host, VDD>4.5V		2.5	-	-	ns
		Host, VDD>2.7V		2.5	-	-
tSSCK	Client SCK Period	Client	Reception	2*(tSIS+tHOST_OUT) (5)	-	-	ns
		Client	Transmission	2*(tSOV+tHOST_IN) (6)	-	-
tSSCKW	SCK high/low width	Client		-	0.5*tSSCK	-	ns
tSSCKR	SCK rise time (2)	Client		-	0.25*tSSCK	-	ns
tSSCKF	SCK fall time (2)	Client		-	0.25*tSSCK	-	ns
tSIS	MOSI setup to SCK	Client, VDD>4.5V		13.6	-	-	ns
		Client, VDD>2.7V		14.1	-	-
tSIH	MOSI hold after SCK	Client, VDD>4.5V		0	-	-	ns
		Client, VDD>2.7V		0	-	-
tSSS	SS setup to SCK	Client	PRELOADEN=1	tSOSS+tEXT_MIS+2*tAPBC (8) (9)	-	-	ns
			PRELOADEN=0	tSOSS+tEXT_MIS (8)	-	-
tSSH	SS hold after SCK	Client		0.5*tSSCK	-	-	ns
tSOV	MISO output valid SCK	Client, VDD>4.5V		-	-	45	ns
		Client, VDD>2.7V		-	-	55.1
tSOH	MISO hold after SCK	Client, VDD>4.5V		11.9	-	-	ns
		Client, VDD>2.7V		11.9	-	-
tSOSS	MISO setup after SS low	Client, VDD>4.5V		-	-	41	ns
		Client, VDD>2.7V		-	-	50.7
tSOSH	MISO hold after SS high	Client, VDD>4.5V		11.1	-	-	ns
		Client, VDD>2.7V		11.1	-	-

1. These values are based on simulation. These values are not covered by test limits in production.
2. See I/O pin characteristics.
3. Where t_{CLIENT_OUT} is the client external device output response time, generally t_{EXT_SOV}+t_{LINE_DELAY} ⁽⁷⁾.
4. Where t_{CLIENT_IN} is the client external device input constraint, generally t_{EXT_SIS}+t_{LINE_DELAY} ⁽⁷⁾.
5. Where t_{HOST_OUT} is the host external device output response time, generally t_{EXT_MOV}+t_{LINE_DELAY} ⁽⁷⁾.
6. Where t_{HOST_IN} is the host external device input constraint, generally t_{EXT_MIS}+t_{LINE_DELAY} ⁽⁷⁾.
7. t_{LINE_DELAY} is the transmission line time delay.
8. t_{EXT_MIS} is the input constraint for the host external device.
9. t_APBC is the APB period for SERCOM.
10. When the integrity of communication is required to maintain both transmission and reception, the maximum SPI clock frequency should be the lowest value of the reception or transmission mode maximum frequency as shown in the following equations.
    • Reception: t_SCK = 2*(t_MIS+t_{CLIENT_OUT})
    • Transmission: t_SCK = 2*(t_MOV+t_{CLIENT_IN})