Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 17 ASYNCHRONOUS SERIAL INTERFACE C (UARTC)
R01UH0042EJ0500 Rev.5.00 Page 738 of 1513
Aug 12, 2011
17.5 Interrupt Request Signals
The following two interrupt request signals are generated from UARTCn.
• Reception completion interrupt request signal (INTUCnR)
• Transmission enable interrupt request signal (INTUCnT)
The default priority for these two interrupt request signals is reception completion interrupt request signal then
transmission enable interrupt request signal.
Table 17-3. Interrupts and Their Default Priorities
Interrupt Priority
Reception complete High
Transmission enable Low
(1) Reception completion interrupt request signal (INTUCnR)
A reception completion interrupt request signal is output when data is shifted into the receive shift register and
transferred to the UCnRX register in the reception enabled status.
A reception completion interrupt request signal is also output when a reception error occurs. Therefore, when a
reception completion interrupt request signal is acknowledged and the data is read, read the UCnSTR register and
check that the reception result is not an error.
No reception completion interrupt request signal is generated in the reception disabled status.
(2) Transmission enable interrupt request signal (INTUCnT)
If transmit data is transferred from the UCnTX register to the UARTCn transmit shift register with transmission
enabled, the transmission enable interrupt request signal is generated.