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 | 
                        
                    
                    
                        
                        
                            | fSCK | 
                            SCK clock frequency | 
                            Master | 
                            - | 
                            - | 
                            10 | 
                            MHz | 
                        
                        
                            | tSCK | 
                            SCK period | 
                            Master | 
                            100 | 
                            - | 
                            - | 
                            ns | 
                        
                        
                            | tSCKW | 
                            SCK high/low width | 
                            Master | 
                            - | 
                            0.5×tSCK | 
                            - | 
                            ns | 
                        
                        
                            | tSCKR | 
                            SCK rise time | 
                            Master | 
                            - | 
                            2.7 | 
                            - | 
                            ns | 
                        
                        
                            | tSCKF | 
                            SCK fall time | 
                            Master | 
                            - | 
                            2.7 | 
                            - | 
                            ns | 
                        
                        
                            | tMIS | 
                            MISO setup to SCK | 
                            Master | 
                            - | 
                            10 | 
                            - | 
                            ns | 
                        
                        
                            | tMIH | 
                            MISO hold after SCK | 
                            Master | 
                            - | 
                            10 | 
                            - | 
                            ns | 
                        
                        
                            | tMOS | 
                            MOSI setup to SCK | 
                            Master | 
                            - | 
                            0.5×tSCK | 
                            - | 
                            ns | 
                        
                        
                            | tMOH | 
                            MOSI hold after SCK | 
                            Master | 
                            - | 
                            1.0 | 
                            - | 
                            ns |