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SC16IS752IPW датащи(PDF) 38 Page - NXP Semiconductors

номер детали SC16IS752IPW
подробное описание детали  Dual UART with I2C-bus/SPI interface, 64 bytes of transmit and receive FIFOs, IrDA SIR built-in support
PDF  59 Pages
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производитель  NXP [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo NXP - NXP Semiconductors

SC16IS752IPW датащи(HTML) 38 Page - NXP Semiconductors

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SC16IS752_SC16IS762_7
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 07 — 19 May 2008
38 of 59
NXP Semiconductors
SC16IS752/SC16IS762
Dual UART with I2C-bus/SPI interface, 64-byte FIFOs, IrDA SIR
In a single master system, the ‘Repeated START’ mechanism may be more efficient than
terminating each transfer with a STOP and starting again. In a multimaster environment,
the determination of which format is more efficient could be more complicated, as when a
master is using repeated STARTs occupies the bus for a long time, and thus preventing
other devices from initiating transfers.
Fig 17. I2C-bus data formats
002aab458
DATA
SLAVE ADDRESS
master write:
S
W
A
DATA
A
A
P
data transferred
(n bytes + acknowledge)
START condition
STOP condition
acknowledge
acknowledge
acknowledge
write
DATA
SLAVE ADDRESS
master read:
S
R
A
DATA
A
NA
P
data transferred
(n bytes + acknowledge)
START condition
STOP condition
acknowledge
acknowledge
not
acknowledge
read
DATA
SLAVE ADDRESS
combined
formats:
S
R/W
A
DATA
A
A
P
data transferred
(n bytes + acknowledge)
START condition
STOP condition
acknowledge
acknowledge
acknowledge
read or
write
SLAVE ADDRESS
Sr
R/W
A
repeated
START condition
acknowledge
read or
write
direction of transfer
may change at this point
data transferred
(n bytes + acknowledge)



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