pcf85132 NXP Semiconductors, pcf85132 Datasheet - Page 23

• Manufacturer Part Number: pcf85132
• Description: Pcf85132 Lcd Driver For Low Multiplex Rates
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCF85132
Product data sheet
7.16.2 System configuration
7.16.3 Acknowledge
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. The system configuration is shown in
The number of data bytes transferred between the START and STOP conditions from
transmitter to receiver is unlimited. Each byte of eight bits is followed by an acknowledge
cycle.
Acknowledgement on the I
Fig 14. Definition of START and STOP conditions
Fig 15. System configuration
•
•
•
•
A slave receiver which is addressed must generate an acknowledge after the
reception of each byte.
Also a master receiver must generate an acknowledge after the reception of each
byte that has been clocked out of the slave transmitter.
The device that acknowledges must pull-down the SDA line during the acknowledge
clock pulse, so that 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
consideration).
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.
SCL
SDA
SDA
SCL
TRANSMITTER/
RECEIVER
MASTER
START condition
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S
Rev. 1 — 23 November 2010
RECEIVER
2
C-bus is shown in
SLAVE
TRANSMITTER/
RECEIVER
SLAVE
Figure
LCD driver for low multiplex rates
16.
TRANSMITTER
MASTER
STOP condition
P
PCF85132
TRANSMITTER/
© NXP B.V. 2010. All rights reserved.
RECEIVER
MASTER
mbc622
Figure
mga807
SDA
SCL
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15.