uda1338h-n1 NXP Semiconductors, uda1338h-n1 Datasheet - Page 20

• Manufacturer Part Number: uda1338h-n1
• Description: Multichannel Audio Coder-decoder
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 14389
Product data sheet
10.4 Byte transfer
10.5 Data transfer
10.6 Start and stop conditions
10.7 Acknowledgment
Each byte (8 bits) is transferred with the MSB first; see
Table 16:
A device generating a message is a transmitter; a device receiving a message is the
receiver. The device that controls the message is the master and the devices which are
controlled by the master are the slaves.
Both data and clock line will remain HIGH when the bus is not busy. A HIGH-to-LOW
transition of the data line, while the clock is HIGH, is defined as a start condition (S);
see
defined as a stop condition (P).
The number of data bits transferred between the start and stop conditions from the
transmitter to receiver is not limited. Each byte of eight bits is followed by one
acknowledge bit; see
master and the master generates an extra acknowledge related clock pulse.
A slave receiver which is addressed, must generate an acknowledge after the reception of
each byte. Also a master must generate an acknowledge after the reception of each byte
that has been clocked out of the slave transmitter.
The device that acknowledges has to pull down the SDA line during the acknowledge
clock pulse, so the SDA line is stable LOW during the HIGH period of the acknowledge
related clock pulse. Set-up and hold times must be taken into account. A master receiver
must signal an end of data to the transmitter by not generating an acknowledge on the last
byte that has been clocked out of the slave. In this event, the transmitter must leave the
data line HIGH to enable the master to generate a stop condition.
MSB
7
Fig 13. Bit transfer on the I
Figure
Byte transfer
14. A LOW-to-HIGH transition of the data line while the clock is HIGH is
Bit number
6
SDA
SCL
Rev. 03 — 16 February 2005
Figure
5
2
C-bus
15. At the acknowledge bit the data line is released by the
4
data valid
data line
stable;
3
allowed
change
of data
Multichannel audio coder-decoder
Table
2
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
16.
UDA1338H
mbc621
1
LSB
0
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