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Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
13.2.4 Interrupt
requests
The following three types of interrupt requests are generated from UART50, UART51.
•
Reception error interrupt (INTSERn)
•
Reception completion interrupt (INTSRn)
•
Transmission completion interrupt (INTSTn)
The default priorities among these three types of interrupt requests is, from high to low, reception error
interrupt, reception completion interrupt, and transmission completion interrupt (n = 0, 1).
Table 13-1:
Generated Interrupts and Default Priorities
(1)
Reception error interrupt (INTSER0, INTSER1)
When reception is enabled, a reception error interrupt is generated according to the logical OR of
the three types of reception errors explained for the ASISn register. Whether a reception error
interrupt (INTSERn) or a reception completion interrupt (INTSRn) is generated when an error
occurs can be specified according to the ISRM bit of the ASIMn register.
When reception is disabled, no reception error interrupt is generated.
(2)
Reception completion interrupt (INTSR0, INTSR1)
When reception is enabled, a reception completion interrupt is generated when data is shifted in to
the reception shift register and transferred to the reception buffer register (RXBn).
A reception completion interrupt request can be generated in place of a reception error interrupt
according to the ISRM bit of the ASIMn register even when a reception error has occurred.
When reception is disabled, no reception completion interrupt is generated.
(3)
Transmission completion interrupt (INTST0, INTST1)
A transmission completion interrupt is generated when one frame of transmit data containing 7-bit
or 8-bit characters is shifted out from the transmission shift register.
Interrupt
Priority
Reception error
1
Reception completion
2
Transmission completion
3
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