67.6.3.2 FLEXCOM USART Timings

Timings are provided in the following conditions:
  • 1.8V domain: VDDIO from 1.7V to 1.9V, maximum external capacitor = 10 pF, DRV = 1, SR = 1
  • 3.3V domain: VDDIO from 3.0V to 3.6V, maximum external capacitor = 10 pF, DRV = 0, SR = 1
Table 67-23. FLEXCOM USART Timings
Symbol Parameter Conditions Min Max Unit
fSCK SCK frequency Synchronous (SYNC=1), host or client – 25 MHz
fS UART sampling clock frequency Asynchronous (SYNC=0)(1) – 25 MHz
Note:
  1. The corresponding baud rate frequency is f = fS / 8 = 3.1 MHz with oversampling FLEX_US_MR.OVER=1. f = fS / 16 = 1.5 MHz with oversampling FLEX_US_MR.OVER = 0. Refer to the Baud Rate Generator figure in Debug Unit (DBGU) for more details.