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Section 14 Synchronous Serial Communication Unit (SSU)
Rev. 3.00 Mar. 14, 2006 Page 545 of 804
REJ09B0104-0300
14.5 Interrupt
Requests
The SSU interrupt requests are an overrun error, a conflict error, a receive data register full,
transmit data register empty, and a transmit end interrupts. Of these interrupt sources, a receive
data register full, a transmit data register empty, and a transmit end interrupts can activate the
DMAC for data transfer.
Since both an overrun error and a conflict error interrupts are allocated to the SSERI vector
address, and both a transmit data register empty and a transmit end interrupts are allocated to the
SSTXI vector address, the interrupt source should be decided by their flags. Table 14.7 lists the
interrupt sources.
When an interrupt condition shown in table 14.7 is satisfied, an interrupt is requested. Clear the
interrupt source by CPU or DMAC data transfer.
Table 14.7 Interrupt Sources
Channel Abbreviation Interrupt Source
Symbol Interrupt Condition
DMAC
Activation
0 SSERI0 Overrun
error
OEI0
(RIE
=
1)
•
(ORER
=
1)
Conflict
error
CEI0
(CEIE
=
1)
•
(CE
=
1)
SSRXI0
Receive data register full
RXI0
(RIE
=
1)
•
(RDRF
=
1)
Yes
SSTXI0
Transmit data register empty
TXI0
(TIE
=
1)
•
(TDRE
=
1)
Yes
Transmit
end
TEI0
(TEIE
=
1)
•
(TEND
=
1)
Yes
1 SSERI1 Overrun
error
OEI1
(RIE
=
1)
•
(ORER
=
1)
Conflict
error
CEI1
(CEIE
=
1)
•
(CE
=
1)
SSRXI1
Receive data register full
RXI1
(RIE
=
1)
•
(RDRF
=
1)
Yes
SSTXI1
Transmit data register empty
TXI1
(TIE
=
1)
•
(TDRE
=
1)
Yes
Transmit
end
TEI1
(TEIE
=
1)
•
(TEND
=
1)
Yes
2 SSERI2 Overrun
error
OEI2
(RIE
=
1)
•
(ORER
=
1)
Conflict
error
CEI2
(CEIE
=
1)
•
(CE
=
1)
SSRXI2
Receive data register full
RXI2
(RIE
=
1)
•
(RDRF
=
1)
Yes
SSTXI2
Transmit data register empty
TXI2
(TIE
=
1)
•
(TDRE
=
1)
Yes
Transmit
end
TEI2
(TEIE
=
1)
•
(TEND
=
1)
Yes
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