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R01UH0336EJ0102 Rev.1.02
Page 1242 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 22 Synchronous/Asynchronous Serial Interface H (UARTH)
22.5 Interrupt Request Signals
The following 3 interrupt request signals are generated by UARTHn.
• Transmission interrupt request URTHnTIT
• Reception interrupt request URTHnTIR
• Status interrupt request URTHnTIS
22.5.1
Transmission Interrupt Request URTHnTIT
When data for transmission are transferred from the URTHnTX register to the
transmission shift register while transmission is enabled, a transmission
interrupt request (URTHnTIT) will be generated.
The condition for generation of a transmission interrupt request depends on
the setting of the URTHnCTL1.URTHnSLIT.
• At the start of transmission processing: URTHnCTL1.URTHnSLIT = 0.
A transmission interrupt request is issued when transmission of the first bit
starts (the start bit in data transmission or the first bit of the BF in BF
transmission). During data transmission, a transmission interrupt request is
issued when data for transmission in the URTHnTX register are transferred
to the transmission shift register.
• At the end of transmission processing: URTHnCTL1.URTHnSLIT = 1.
A transmission interrupt request is issued on completion of transmission of
the last bit (the stop bit when the stop bit length is 1, or the 2nd of the stop
bits when the stop bit length is 2).
Note
Detection of a data consistency error leads to the generation of a URTHnTIS
interrupt, so this interrupt will not be generated.
The following diagrams show when transmission interrupt requests are
generated at the start and the end of transmission processing, respectively.
Figure 22-2
Timing of a Transmission Interrupt Request for
URTHnCTL1.URTHnSLIT = 0
URTHnTXD
URTHnTIT
Bit being transmitted
Clock from baud-rate generator
Data transmission
BF transmission
Start
Bit 0
Bit 6
Stop 1
BF1
BF13
Stop 1
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