Restarting The Reload Counter - Fujitsu MB91460 SERIES FR60 User Manual

Transmission/
Reception Clock
Reload
001
Count
Transmission/
Reception Clock
Reload
417
Count
(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.)
Figure 6-2 Counting example of the reload counters
000 832 831
reload count value
416 415 414
830 829 828
413 412 411
Chapter 32 USART (LIN / FIFO)
6.USART Baud Rates
827
410
645