PCF2104CUSLASH2 datasheet(43/56 Pages) MOTOROLA

43 / 56 page

Notes

1. X = don’t care.

2. SDA is left at high-impedance by the microcontroller during the READ acknowledge.

(optional I2C-bus stop) I2C-bus start + slave address for write

(as step 8)

PHILIPS_

Control byte:

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

PHILIPS_

Return home:

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

DB1 = 1; DB0 = 0; Ack = 1

PHILIPS

Sets DDRAM address 0 in Address Counter. (Also returns

shifted display to original position. DDRAM contents

unchanged). This instruction does not update the Data

Control byte for read:

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

PHILIPS

DDRAM content will be read from following instructions.

The R/W has to be set to 1 while still in I2C-bus write

mode.

I2C-bus start

PHILIPS

Slave address for read:

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

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

PHILIPS

During the acknowledge cycle the content of the DR 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 DR was unknown.

Read data: 8

× SCL + master acknowledge; note 2:

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

DB1 = X; DB0 = X; Ack = 1

PHILIPS

× SCL; content loaded into interface 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.

Read data: 8

× SCL + master acknowledge; note 2:

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

DB1 = 0; DB0 = 0; Ack = 0

PHILIPS

× SCL; code of letter ‘H’ is read ﬁrst. During master

acknowledge code of ‘I’ is loaded into the I2C-bus

interface.

Read data: 8

× SCL + no master acknowledge; note 2:

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

DB1 = 0; DB0 = 1; Ack = 1

PHILIPS

No master acknowledge; After the content of the I2C-bus

interface register is shifted out no internal action is

performed. No new data is loaded to the interface register,

Data Register (DR) is not updated, Address Counter (AC)

is not incremented and cursor is not shifted.

I2C stop

PHILIPS

STEP

I2C-BUS BYTE

DISPLAY

OPERATION

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