參數(shù)資料
型號： UPD6708GS
廠商： NEC Corp.
英文描述： IEBusa Inter Equipment Busa PROTOCOL CONTROL LSI
中文描述： IEBusa設備布薩間協(xié)議控制大規(guī)模集成電路
文件頁數(shù)： 49/72頁
文件大小： 292K
代理商： UPD6708GS
49
μ
PD6708
8.2
Interrupt Service Routine
This routine is used when an interrupt request is generated from the
μ
PD6708 (when IRQ pin becomes high). This routine
reads the contents of the return code, performs flag setting, and reads receive data.
Notes 1.
See 8.3.3.
See 8.3.4.
See 8.3.5.
2.
3.
Start
Disable interrupts
from PD6708
Is SIO register used
Save value of I/O port which controls PD6708 C/D and
R/W pins, and value of SIO register in host controller
Read STR
Return code classification
01
Master reception
processing
routine
Note 3
Master
transmission
processing
routine
Note 1
Slave data
transmission
processing
routine
Note 2
Master
Slave reception
processing
routine
Broadcast
reception
processing
routine
10
11
Restore value of I/O port which controls PD6708 C/D
and R/W pins, and value of SIO register in host controller
Enable interrupts
from PD6708
End
RETI
00
Y
N
Y
N
This processing is not necessary
if interrupts are disabled when
SIO is used in the main routine.
Most significant 2 bits
of return code
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相關代理商/技術參數(shù)
參數(shù)描述
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