Section 17 Synchronous Serial Communication Unit (SSU)
Rev. 1.00 Mar. 12, 2008 Page 583 of 1178
REJ09B0403-0100
17.5 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
DTC 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 17.5 lists the
interrupt sources.
When an interrupt condition shown in table 17.5 is satisfied, an interrupt is requested. Clear the
interrupt source by CPU or DTC data transfer.
Table 17.5 Interrupt Sources
Abbreviation Interrupt
Source
Symbol Interrupt
Condition
DTC
Activation
SSERI Overrun
error
OEI (RIE
=
1)
•
(ORER
=
1)
Conflict
error
CEI
(CEIE
=
1)
•
(CE
=
1)
SSRXI
Receive data register full
RXI
(RIE
=
1)
•
(RDRF
=
1)
Yes
SSTXI
Transmit data register empty
TXI
(TIE
=
1)
•
(TDRE
=
1)
Yes
Transmit
end
TEI
(TEIE
=
1)
•
(TEND
=
1)
Yes
17.6 Usage
Note
17.6.1
Setting of Module Stop Mode
The SSU can be enabled/disabled by the module stop control register setting and is disabled by the
initial value. Canceling module stop mode enables to access the SSU registers. For details, see
section 28, Power-Down Modes.
Содержание H8S Family
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