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MIC74 датащи(PDF) 11 Page - Micrel Semiconductor

номер детали MIC74
подробное описание детали  2-Wire Serial I/O Expander and Fan Controller Advance Information
PDF  20 Pages
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производитель  MICREL [Micrel Semiconductor]
домашняя страница  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC74 датащи(HTML) 11 Page - Micrel Semiconductor

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August 1, 2000
11
MIC74
MIC74
Micrel
S 00011001 A 0100 A2 A1 A0 0/A P
Alert Response Address
(master requests address
of interupting device)
P0*
/ALERT
Slave Address
(interrupting MIC74
announces its address)
Master-to-slave transmission
Slave-to-master response
STOP
ACKNOWLEDGE
R/W = READ
NOT ACKNOWLEDGE
t/INT
t/IR
* Assumes P0 interrupts properly configured and
enabled. P0 used as an example. Timing for P1
to P7 is identical.
Figure 7. Interrupt Handling Using the Alert Response Address
/A P
S 0001 A2 A1 A0 0 A 000000
XXXXXXXX
11 A
A
Slave Address
(host addresses an MIC74)
P0*
/ALERT
Command Byte
(03h = selects status register)
Status Value†
(MIC74 sends status)
Slave Address
(host addresses an MIC74)
Master-to-slave transmission
Slave-to-master response
ACKNOWLEDGE
R/W = WRITE
S 0001 A2 A1 A0 1
R/W = READ
STOP
NOT ACKNOWLEDGE
t/INT
t/R
* Assumes P0 interrupts properly configured and
enabled. P0 used as an example. Timing for P1
to P7 is identical.
† STATUS register is cleared to zero following this
operation.
ACKNOWLEDGE
ACKNOWLEDGE
Figure 8. Interrupt Handling Without the Alert Response Address



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