PCF8576CT/S480/1,1 NXP Semiconductors, PCF8576CT/S480/1,1 Datasheet - Page 28

• Manufacturer Part Number: PCF8576CT/S480/1,1
• Description: LCD Drivers Universal LCD Driver Low Multiplex Rates
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCF8576C
Product data sheet
7.18 Command decoder
The I
condition (S) from the I
slave addresses available. All PCF8576Cs with the corresponding SA0 level acknowledge
in parallel with the slave address but all PCF8576Cs with the alternative SA0 level ignore
the whole I
After acknowledgement, one or more command bytes follow which define the status of the
addressed PCF8576Cs.
The last command byte is tagged with a cleared most significant bit, the continuation bit C.
The command bytes are also acknowledged by all addressed PCF8576Cs on the bus.
After the last command byte, a series of display data bytes may follow. These display
bytes are stored in the display RAM at the address specified by the data pointer and the
subaddress counter. Both data pointer and subaddress counter are automatically updated
and the data is directed to the intended PCF8576C device. The acknowledgement after
each byte is made only by the (A0, A1, and A2) addressed PCF8576C. After the last
display byte, the I
The command decoder identifies command bytes that arrive on the I
commands carry a continuation bit C in their most significant bit position as shown in
Figure
will also represent a command. If this bit is set logic 0, it indicates that the command byte
is the last in the transfer. Further bytes will be regarded as display data.
The five commands available to the PCF8576C are defined in
Fig 20. I
Fig 21. General format of the command byte
2
(1) C = 0; last command
(2) C = 1; commands continue
C-bus protocol is shown in
21. When this bit is set logic 1, it indicates that the next byte of the transfer to arrive
2
S
2
C-bus protocol
C-bus transfer.
0 1 1 1 0 0
slave address
All information provided in this document is subject to legal disclaimers.
2
C-bus master issues a STOP condition (P).
1 byte
Rev. 11 — 30 March 2012
2
C-bus master which is followed by one of the two PCF8576C
S
A
0
R/W
MSB
0 A C
C
Figure
acknowledge by
all addressed
n ≥ 1 byte(s)
PCF8576Cs
COMMAND
REST OF OPCODE
20. The sequence is initiated with a START
Universal LCD driver for low multiplex rates
A
msa833
DISPLAY DATA
n ≥ 0 byte(s)
LSB
Table
by A0, A1 and A2
update data pointers
subaddress counter
PCF8576C only
PCF8576C
and if necessary,
acknowledge
2
8.
C-bus. All available
selected
© NXP B.V. 2012. All rights reserved.
A
P
mbe538
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