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ST75C520PQFP Datasheet(PDF) 41 Page - STMicroelectronics

No. de pieza ST75C520PQFP
Descripción Electrónicos  HIGH SPEED FAX MODEM DATA PUMP
PDF  45 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST75C520PQFP Datasheet(HTML) 41 Page - STMicroelectronics

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Figure 9 : Buffer Operations Synchronization
Y
N
N
Y
NY
Tx MAIN PROGRAM
INTERRUPT ROUTINE
CSE ERRTX
(only if ERR)
BEGIN
INTERRUPT
NEED TO
TRANSMIT
106 ON
FILL BUFFER #0
UPDATE STATUS
BUFFER #0
FILL BUFFER
#IBUFF
UPDATE STATUS
BUFFER #IBUFF
CLEAR IT2
TOGGLE IBUFF
IBUFF = 1
XMIT ON
ENABLE IT2
RETURN
106 OFF or
ERROR TX
DISABLE IT2
XMIT OFF
N
Y
YN
Rx MAIN PROGRAM
INTERRUPT ROUTINE
CSE ERRRX
(only if ERR)
109 ON
WRITE $00 IN
DATA STATUS
BUFFER #0 AND #1
ENABLE IT3
109 ON
DISABLE IT3
READ BUFFER
#IBUFF
WRITE $00
IN DATA STATUS
BUFFER #IBUFF
CLEAR IT3
TOGGLE IBUFF
RETURN
INTERRUPT
BEGIN
IBUFF = 0
ST75C520
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