46.15 USART

Figure 46-4. USART in SPI Mode - Timing Requirements in Host Mode

Table 46-20. USART in SPI Host Mode - Timing Characteristics
Symbol	Description	Min.	Typ. ✝	Max.	Units
f_SCK⁽¹⁾	SCK clock frequency	—	—	f_{CLK_PER}/2	MHz
T_SCK⁽¹⁾	SCK period	2×T_{CLK_PER}	—	—	ns
t_SCKW	SCK high/low width	—	0.5×T_SCK	—	ns
t_MOS	MOSI valid before SCK	—	0.5×T_SCK		ns
t_MOH	MOSI hold after SCK	—	0.5×T_SCK	—	ns
t_MIS	MISO setup to SCK	—	T_{CLK_PER}	—	ns
t_MIH	MISO hold after SCK	—	0	—	ns
✝Unless otherwise specified, data in the “Typ.” column is at T_A = 25°C and V_DD = 3.0V. These parameters are not tested and are for design guidance only. Note: These parameters are characterized but not tested in production.