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SC16IS752 Datasheet(PDF) 36 Page - NXP Semiconductors

Part No. SC16IS752
Description  Dual UART with I2C-bus/SPI interface, 64 bytes of transmit and receive FIFOs, IrDA SIR built-in support
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

SC16IS752 Datasheet(HTML) 36 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
36 of 59
NXP Semiconductors
SC16IS752/SC16IS762
Dual UART with I2C-bus/SPI interface, 64-byte FIFOs, IrDA SIR
A slave receiver must generate an acknowledge after the reception of each byte, and a
master must generate one after the reception of each byte clocked out of the slave
transmitter. When designing a system, it is necessary to take into account cases when
acknowledge is not received. This happens, for example, when the addressed device is
busy in a real-time operation. In such a case the master, after an appropriate ‘time-out’,
should abort the transfer by generating a STOP condition, allowing other transfers to take
place. These ‘other transfers’ could be initiated by other masters in a multimaster system,
or by this same master.
There are two exceptions to the ‘acknowledge after every byte’ rule. The first occurs when
a master is a receiver: it must signal an end of data to the transmitter by not signalling an
acknowledge on the last byte that has been clocked out of the slave. The acknowledge
related clock generated by the master should still take place, but the SDA line will not be
pulled down. In order to indicate that this is an active and intentional lack of
acknowledgement, we shall term this special condition as a ‘negative acknowledge’.
The second exception is that a slave will send a negative acknowledge when it can no
longer accept additional data bytes. This occurs after an attempted transfer that cannot be
accepted.
Fig 14. Data transfer on the I2C-bus
S
P
SDA
SCL
MSB
0
1
6
7
8
0
1
2 to 7
8
ACK
ACK
002aab012
START
condition
STOP
condition
acknowledgement signal
from receiver
byte complete,
interrupt within receiver
clock line held LOW
while interrupt is serviced
Fig 15. Acknowledge on the I2C-bus
S
01
6
7
8
002aab013
data output
by transmitter
data output
by receiver
SCL from master
START
condition
transmitter stays off of the bus
during the acknowledge clock
acknowledgement signal
from receiver


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