pcf85176 NXP Semiconductors, pcf85176 Datasheet - Page 22

• Manufacturer Part Number: pcf85176
• Description: Universal Lcd Driver For Low Multiplex Rates
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCF85176_1
Product data sheet
The I
condition (S) from the I
slave addresses available. All PCF85176 whose SA0 inputs correspond to bit 0 of the
slave address respond by asserting an acknowledge in parallel. This I
ignored by all PCF85176 whose SA0 inputs are set to the alternative level.
After an acknowledgement, one or more command bytes follow that define the status of
each addressed PCF85176.
The last command byte sent is identified by resetting its most significant bit, continuation
bit C (see
PCF85176 on the bus.
After the last command byte, one or more display data bytes may follow. Display data
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 directed to the intended PCF85176 device.
An acknowledgement after each byte is asserted only by the PCF85176 that are
addressed via address lines A0, A1, and A2. After the last display byte, the I
master asserts a STOP condition (P). Alternately a START may be asserted to restart an
I
2
Fig 16. I
Fig 17. Format of command byte
•
•
C-bus access.
Up to 16 PCF85176 for very large LCD applications
The use of two types of LCD multiplex drive
2
C-bus protocol is shown in
2
S
Figure
C-bus protocol
0 1 1 1 0 0
slave address
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17). The command bytes are also acknowledged by all addressed
1 byte
2
Rev. 01 — 14 April 2010
C-bus master which is followed by one of two possible PCF85176
S
A
0
R/W
MSB
0 A C
C
Figure
acknowledge by
all addressed
n ≥ 1 byte(s)
PCA85176s
COMMAND
REST OF OPCODE
16. The sequence is initiated with a START
Universal LCD driver for low multiplex rates
A
msa833
DISPLAY DATA
n ≥ 0 byte(s)
LSB
by A0, A1 and A2
update data pointers
subaddress counter
PCA85176 only
and if necessary,
acknowledge
PCF85176
selected
2
C-bus transfer is
© NXP B.V. 2010. All rights reserved.
A
013aaa053
P
2
C-bus
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