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ST75C540 Datasheet(PDF) 62 Page - STMicroelectronics

Part # ST75C540
Description  SUPER INTEGRATED DEVICESWITH DSP, AFE & MEMORIES FORTELEPHONY,MODEM, FAXOVERINTERNET& POTSLINES
PDF  84 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST75C540 Datasheet(HTML) 62 Page - STMicroelectronics

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SINTR
0
1
2
3
4
5
6
0
1
2
3
4
5
6
7
R
S
Q
(Rx buffer filled)
ITRES 3
(write only)
R
S
Q
(Tx buffer emptied)
ITRES 2
(write only)
From
ST75C540
DSP
ITSRCR
(read only)
ITMASK
(read write)
Figure 24
No
Yes
=0
No
Yes
RETURN
IT
READ ITSRCR
MASK UNWANTED BITS
BIT 2 = 1
EXECUTE IT_TRANSMIT
WRITE 00 INTO ITRES2
No
Yes
BIT 3 = 1
EXECUTE IT_RECEIVE
WRITE 00 INTO ITRES3
(Other Interrupts)
Execute Tx Buffer
Management
Reset IT2
Execute Rx Buffer
Management
Reset IT3
If all sources served return from interrupt
Check only the Interrupt sources
that we want to manage under Interrupt
Figure 25
X - PARALLEL DATA EXCHANGE (continued)
ST75C530 - ST75C540
62/84



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