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R01UH0336EJ0102 Rev.1.02
Page 1261 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 22 Synchronous/Asynchronous Serial Interface H (UARTH)
22.6.11
Continuous Transmission Procedure
Continuous transmission is achieved by setting URTHnCTL1.URTHnSLIT = 0,
using the URTHnTIT interrupt to confirm the timing with which data for
transmission that have been written to the URTHnTX register are transferred
to the transmission shift register, and then writing the next data for
transmission to the data register while data transmission is in progress.
Caution
If a value is written to the URTHnTX register before the URTHnTIT is
generated, previously set data for transmission are overwritten by the new
data.
To initialize the transmission unit (by setting URTHnTXE = 0 or URTHnPWR =
0), confirm that no transmission is ongoing (i.e. that
URTHnSTR0.URTHnSSBT = URTHnSST = 0). Initialization while transmission
is ongoing leads to transmission being aborted.
Figure 22-12
Continuous Transmission Processing Flow
Start
Register settings
(when URTHnCTL1.URTHnSLIT = 0)
Was a transmission
interrupt generated?
Has writing proceeded
the required number of times?
End
No
No
Writing to URTHnTX
Yes
Yes
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