CHAPTER 19 IEBus CONTROLLER (V850/SB2)
User’s Manual U13850EJ4V0UM
479
19.4.2 Interrupt source list
The interrupt request signals of the internal IEBus controller in the V850/SB2 can be classified into vector interrupts
and DMA transfer interrupts. These interrupt request signals can be specified through software manipulation.
The interrupt sources are listed below.
Table 19-9. Interrupt Source List
Condition of Generation
Interrupt Source
Unit
Field
CPU Processing after
Generation of Interrupt
Remark
Timing error
Master/slave
All fields
Other than data
(individual)
Parity error
Reception
All fields
(broadcasting)
NACK reception
Reception
(Transmission)
Other than data
(individual)
Underrun error
Transmission
Data
Com
m
uni
ca
tion error
Overrun error
Reception
Data
(broadcasting)
Undo communication
processing
Communication error is OR
output of timing error, parity
error, NACK reception,
underrun error, and overrun
error
Master
Slave/address
Slave request judgment
Contention judgment
(If loses, remaster processing)
Communication preparation
processing
Interrupt always occurs if loses
in contention during master
request
Start interrupt
Slave
Slave/address
Slave request judgment
Communication preparation
processing
Generated only during slave
request
Status transmission
Slave
Control
Refer to transmission
processing example such as
slave status.
Interrupt occurs regardless of
slave transmission enable flag
Interrupt occurs if NACK is
returned in the control field.
Transmission
Data
DMA transfer end processing
End of communication
Reception
Data
DMA transfer end processing
Receive data processing
Set if SCR is cleared to 0
Transmission
Data
Retransmission preparation
processing
End of frame
Reception
Data
Re-reception preparation
processing
Set if CCR is cleared to 0
Transmit data write
Transmission
Data
Reading of transmit data
Note
.
Set after transfer transmission
data to internal shift register
This does not occur when the
last data is transferred.
Receive data read
Reception
Data
Reading of received data
Note
Set after normal data reception
Note
If DMA transfer or software manipulation is not executed.
Содержание MPD703030A
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