User’s Manual U11969EJ3V0UM00
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CHAPTER 8 SERIAL INTERFACE FUNCTION
8.2.4 Interrupt request
UART generates the following three types of interrupt requests:
• Receive error interrupt (INTSER)
• Reception completion interrupt (INTSR)
• Transmission completion interrupt (INTST)
Of these three, the receive error interrupt has the highest default priority, followed by the reception completion
interrupt and transmission completion interrupt.
Table 8-1. Default Priority of Interrupts
Interrupt
Priority
Receive error
1
Reception completion
2
Transmission completion
3
(1) Receive error interrupt (INTSER)
A receive error interrupt occurs as a result of ORing the three types of receive errors described in description
of the ASIS registers when reception is enabled.
This interrupt does not occur when reception is disabled.
(2) Reception completion interrupt (INTSR)
The reception completion interrupt occurs if data is received in the receive shift register and then transferred
to the receive buffer when reception is enabled.
This interrupt also occurs when a receive error occurs, but the receive error interrupt has higher priority.
The reception completion interrupt does not occur when reception is disabled.
(3) Transmission completion interrupt (INTST)
Because the UART does not have a transmit buffer, a transmission completion interrupt occurs when one frame
of transmit data including a 7-/8-/9-bit character is shifted out from the transmit shift register.
The transmission completion interrupt is output when the last bit of data has been transmitted.
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