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15.6
Interrupt
An AFE interface is capable of generating five interrupts. Among these interrupts, four interrupts
of TDEI, RDFI, TERI, and RERI are issued by setting the enable bits in CTR to 1. On the other
hand, an interrupt of RDWT is masked by setting the RDETM bit to 1.
Interrupt
Source
Issuance Condition
How to clear the interrupt
TDEI
Transmit register or buffer includes no transmit data.
Clear the TDE bit in STR
RDFI
Receive register or buffer is full of received data.
Clear the RDF bit in STR
TERI
Next data transmit starts while no transmit data is
included.
Clear the TERR bit in STR
RERI
Receive register or buffer receives the next data in
spite of being in the full status.
Clear the RERR bit in STR
RDET
When a low level is input to the RING pin (this is a
level interrupt).
Write 1 to the RSW bit in CTR
Figures 15-4 and 15-5 shown below display the output timings of TDEI and RDFI.
For timings of TERI and RERI, TERI is output when the last word data transmission starts while
RERI is output when the last word data transmission is completed. When the BUFD bit is set to 1,
transmission is performed in 1 word, but output timings do not differ from those of TDEI and
RDFI.
FS
DIN
(TxD)
data48
data47
data2
data1
TDEI
Figure 15.4 TDEI Output Timing
Summary of Contents for HD64465
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