38.5.4 USART

Figure 38-4. USART in SPI Mode - Timing Requirements in Host Mode
Figure 38-5. USART in SPI Mode - Timing Requirements in Client Mode
Table 38-19. USART in SPI Host Mode - Timing Specifications
Symbol Description Min. Typ.✝ Max. Unit Condition
fSCK * SCK clock frequency — — fCLK_PER / 2 MHz
TSCK * SCK period 2 × TCLK_PER — — ns
tSCKW SCK high/low width — 0.5 × TSCK — ns
tSCKR SCK rise time — 2.7 — ns
tSCKF SCK fall time — 2.7 — ns
tMIS MISO setup to SCK — 10 — ns
tMIH MISO hold after SCK — 10 — ns
tMOS MOSI setup to SCK — 0.5 × TSCK — ns
tMOH MOSI hold after SCK — 1.0 — ns

✝ Data found in the “Typ.” column is at TA = 25°C and VDD = 3.0V unless otherwise specified. These parameters are not tested and are for design guidance only.

* These parameters are characterized but not tested in production.