37.13 USART

Figure 37-4. USART in SPI Mode - Timing Requirements in Host Mode

Table 37-18. USART in SPI Host Mode - Timing Characteristics
Symbol	Description	Min.	Typ.	Max.	Unit
f_SCK	SCK clock frequency	—	—	f_{CLK_PER}/2	MHz
T_SCK	SCK period	2×T_{CLK_PER}	—	—	ns
t_SCKW	SCK high/low width	—	0.5×T_SCK	—	ns
t_SCKR	SCK rise time	—	2.7	—	ns
t_SCKF	SCK fall time	—	2.7	—	ns
t_MIS	MISO setup to SCK	—	10	—	ns
t_MIH	MISO hold after SCK	—	10	—	ns
t_MOS	MOSI setup to SCK	—	0.5×T_SCK	—	ns
t_MOH	MOSI hold after SCK	—	1.0	—	ns