參數(shù)資料
型號: CD1865
廠商: Intel Corp.
英文描述: Intelligent Eight-Channel Communications Controller
中文描述: 智能八通道通信控制器
文件頁數(shù): 42/150頁
文件大?。?/td> 871K
代理商: CD1865
CD1865
Intelligent Eight-Channel Communications Controller
42
Datasheet
5.5.5
Comparison of Interrupt and Polled Code Sequences
Figure 12
and
Figure 13
show the code sequences for polled and interrupt service request methods.
Figure 12. Polled Code Sequence
READ SERVICE REQUEST STATUS
FROM SRSR
RECEIVE
REQUEST
PENDING
TRANSMIT
REQUEST
PENDING
MODEM SIGNAL CHANGE
REQUEST PENDING
N
N
READ REQUESTING CHANNEL NUMBER
READ NUMBER OF BYTES FROM RDCR
SET UP HOST
S BUFFER POINTERS
SET LOOP COUNTER = RDCR
READ RDR
WRITE DATA TO POINTER LOCATION
INCREMENT POINTER
DECREMENT LOOP COUNTER
IF
LOOP COUNTER = 0
SAVE POINTER
EXIT ISR
READ RRAR TO ACKNOWLEDGE,
GET STATUS VECTOR
GOOD DATA
Y
Y
Y
TO
TRANSMIT
ROUTINE
TO
MODEM
ROUTINE
N
HANDLE
BAD
DATA
Y
N
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