PCF8811U/2DA/1 NXP [NXP Semiconductors], PCF8811U/2DA/1 Datasheet - Page 31

• Manufacturer Part Number: PCF8811U/2DA/1
• Description: 80 x 128 pixels matrix LCD driver
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
11. I
PCF8811_4
Product data sheet
Fig 24. Read mode serial interface 3-line
SDATA
2
SCLK
C-bus interface
SDO
SCE
11.1.1 System configuration
11.1 Characteristics of the I
D/C
DB7
The I
modules with speeds of up to 3.4 MHz. The only difference between Hs-mode slave
devices and F/S-mode slave devices is the speed at which they operate. Because of this
the buffers on the SCLH and SDAH have open-drain outputs. This is the same for I
master devices which have an open-drain SDAH output and a combination of an
open-drain, pull-down and current source pull-up circuits on the SCLH output. Only the
current source of one master is enabled at any one time, and only during Hs-mode. Both
lines must be connected to a positive supply via a pull-up resistor.
Data transfer may be initiated only when the bus is not busy.
The system configuration is shown in
Definitions of the I
•
•
•
•
•
•
•
DB6 DB5 DB4
transmitter: the device which sends the data to the bus
receiver: the device which receives the data from the bus
master: the device which initiates a transfer, generates clock signals and terminates a
transfer
slave: the device addressed by a master
multi-master: more than one master can attempt to control the bus at the same time
without corrupting the message
arbitration: procedure to ensure that, if more than one master simultaneously tries to
control the bus, only one is allowed to do so and the message is not corrupted
synchronization: procedure to synchronize the clock signals of two or more devices
2
C-bus Hs-mode is for bidirectional, two-line communication between different ICs or
DB3 DB2 DB1 DB0
2
C-bus terminology:
Rev. 04 — 27 June 2008
2
C-bus (Hs-mode)
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Figure
25.
80 x 128 pixels matrix LCD driver
PCF8811
© NXP B.V. 2008. All rights reserved.
001aai351
D/C
2
31 of 81
C-bus