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PCF2119VU-2-F2

LCD controllers/drivers

NXP Semiconductors. 

NXP Semiconductors

PCF2119x

LCD controllers/drivers

Table 42. Example of I2C-bus operation; 1-line display (using external reset, assuming pin SA0 = VSS)[1] …continued

Step I2C-bus byte

Display

Operation

16

Write_data to DDRAM

writes ‘S’

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Ack PHILIPS

010100111

17

optional l2C-bus STOP

PHILIPS

18

I2C-bus start

PHILIPS

19

slave address for write

SA6 SA5 SA4 SA3 SA2 SA1 SA0 R/W Ack PHILIPS

011101001

20

control byte

CO RS 0 0 0 0 0 0 Ack PHILIPS

100000001

21

Return_home

sets DDRAM address 0 in address counter

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Ack PHILIPS

000000101

(also returns shifted display to original

position; DDRAM contents unchanged); this

instruction does not update the data register

22

I2C-bus start

PHILIPS

23

slave address for read

during the acknowledge cycle the content of

SA6 SA5 SA4 SA3 SA2 SA1 SA0 R/W Ack PHILIPS

011101011

the data register is loaded into the internal

I2C-bus interface to be shifted out; in the

previous instruction neither a ‘set address’

nor a Read_data has been performed;

therefore the content of the data register

was unknown; bit R/W has to be set to logic

1 while still in I2C-write mode

24

control byte for read

DDRAM content will be read from following

CO RS 0 0 0 0 0 0 Ack PHILIPS

instructions

011000001

25

Read_data: 8 × SCL + master acknowledge[2]

8 × SCL; content loaded into interface

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Ack PHILIPS

XXXXXXXX0

during previous acknowledge cycle is

shifted out over SDA; MSB is DB7; during

master acknowledge content of DDRAM

address 01 is loaded into the I2C-bus

interface

26

Read_data: 8 × SCL + master acknowledge[2]

8 × SCL; code of letter ‘H’ is read first;

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Ack PHILIPS

010010000

during master acknowledge code of ‘I’ is

loaded into the I2C-bus interface

27

Read_data: 8 × SCL + no master acknowledge[2]

no master acknowledge; after the content of

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Ack PHILIPS

010010011

the I2C-bus interface register is shifted out

no internal action is performed; no new data

is loaded to the interface register, data

register is not updated, address counter is

not incremented and cursor is not shifted

28

I2C-bus STOP

PHILIPS

[1] X = don’t care.

[2] SDA is left at high-impedance by the microcontroller during the read acknowledge.

PCF2119X_5

Product data sheet

Rev. 05 — 13 August 2009

© NXP B.V. 2009. All rights reserved.

63 of 79

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