USART

Figure 1. USART in SPI Mode - Timing Requirements in Master Mode

Figure 2. USART in SPI Mode - Timing Requirements in Slave Mode

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