PCF2104CUSLASH2 datasheet(42/56 Pages) MOTOROLA

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Table 9

Example of I2C-bus operation; 1-line display (using internal reset, assuming SA0 = VSS; note 1)

STEP

I2C-BUS BYTE

DISPLAY

OPERATION

1I2C-bus start

Initialized. No display appears.

Slave address for write:

SA6 = 0; SA5 = 1; SA4 = 1; SA3 = 1; SA2 = 0; SA1 = 1;

SA0 = 0; R/W = 0; Ack = 1

During the acknowledge cycle SDA will be pulled-down by

the PCF2104x.

Send a control byte for function set:

Co = 0; RS = 0; R/W = 0; Ack = 1

Control byte sets RS and R/W for following data bytes.

Function set:

DB7 = 0; DB6 = 0; DB5 = 1; DB4 = X; DB3 = 0; DB2 = 0;

DB1 = 0; DB0 = 0; Ack = 1

Selects 1-line display; SCL pulse during acknowledge

cycle starts execution of instruction.

Display on/off control:

DB7 = 0; DB6 = 0; DB5 = 0; DB4 = 0; DB3 = 1; DB2 = 1;

DB1 = 1; DB0 = 0; Ack = 1

Turns on display and cursor. Entire display shows

character Hex 20 (blank in ASCII-like character sets).

Entry mode set:

DB7 = 0; DB6 = 0; DB5 = 0; DB4 = 0; DB3 = 0; DB2 = 1;

DB1 = 1; DB0 = 0; Ack = 1

Sets mode to increment the address by 1 and to shift the

cursor to the right at the time of write to the DDRAM or

CGRAM. Display is not shifted.

7I2C-bus start

For writing data to DDRAM, RS must be set to 1.

Therefore a control byte is needed.

Slave address for write:

SA6 = 0; SA5 = 1; SA4 = 1; SA3 = 1; SA2 = 0; SA1 = 1;

SA0 = 0; R/W = 0; Ack = 1

Send a control byte for write data:

Co = 0; RS = 1; R/W = 0; Ack = 1

Write data to DDRAM:

DB7 = 0; DB6 = 1; DB5 = 0; DB4 = 1; DB3 = 0; DB2 = 0;

DB1 = 0; DB0 = 0; Ack = 1

Writes ‘P’. The DDRAM has been selected at power-up.

The cursor is incremented by 1 and shifted to the right.

Write data to DDRAM:

DB7 = 0; DB6 = 1; DB5 = 0; DB4 = 0; DB3 = 1; DB2 = 0;

DB1 = 0; DB0 = 0; Ack = 1

PH_

Writes ‘H’.

12 to 15

Write data to DDRAM:

DB7 = 0; DB6 = 1; DB5 = 0; DB4 = 1; DB3 = 0; DB2 = 0;

DB1 = 1; DB0 = 1; Ack = 1

PHILIPS_

Writes ‘S’.

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