ATmega4808/4809

32.12 USART

Figure 32-6. USART in SPI Mode - Timing Requirements in Host Mode

Table 32-18. USART in SPI Host Mode - Timing Characteristics⁽¹⁾
Symbol	Description	Condition	Min.	Typ.	Max.	Unit
f_SCK	SCK clock frequency	Host	-	-	10	MHz
t_SCK	SCK period	Host	100	-	-	ns
t_SCKW	SCK high/low width	Host	-	0.5 × t_SCK	-	ns
t_SCKR	SCK rise time	Host	-	2.7	-	ns
t_SCKF	SCK fall time	Host	-	2.7	-	ns
t_MIS	MISO setup to SCK	Host	-	10	-	ns
t_MIH	MISO hold after SCK	Host	-	10	-	ns
t_MOS	MOSI setup to SCK	Host	-	0.5 × t_SCK	-	ns
t_MOH	MOSI hold after SCK	Host	-	1.0	-	ns

Note:

These parameters are for design guidance only and are not production tested.

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