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Chapter 32 USART (LIN / FIFO)
6.USART Baud Rates
Figure 6-2 Counting example of the reload counters
(Note) The falling edge of the Serial Clock Signal always occurs after | (v + 1) / 2 |.
6.2 Restarting the Reload Counter
The Reload Counter can be restarted because of the following reasons:
Transmission and Reception Reload Counter:
• Global MCU Reset
• USART programmable clear (SMR04:UPCL bit)
• User programmable restart (SMR04: REST bit)
Reception Reload Counter:
• Start bit falling edge detection in asynchronous mode
■ Programmable Restart
If the REST bit of the Serial Mode Register (SMR04) is set by the user, both Reload Counters are restarted at
the next clock cycle. This feature is intended to use the Transmission Reload Counter as a small timer.
The following figure illustrates a possible usage of this feature (assume that the reload value is 100.)
001 000 832 831 830 829 828 827
Transmission/
Reload
Count
417 416 415 414 413 412 411 410
Transmission/
Reload
Count
reload count value
Reception Clock
Reception Clock