PCF2113X datasheet(55/72 Pages) PHILIPS

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Table 16 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 SA5 SA4 SA3 SA2 SA1 SA0 R/W Ack

during the acknowledge cycle SDA will be pulled-down by the

PCF2113x

011101001

send a control byte for ‘function set’

Ack

control byte sets RS for following data bytes

000000001

function set

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Ack

selects 1-line display and VLCD =V0; SCL pulse during

acknowledge cycle starts execution of instruction

001X

00001

display on/off control

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Ack

turns on display and cursor; entire display shows character 20H

(blank in ASCII-like character sets)

000011101

entry mode set

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Ack

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

000001101

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 SA5 SA4 SA3 SA2 SA1 SA0 R/WAck

011101001

send a control byte for ‘write data’

Ack

010000001

‘write data’ to DDRAM

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Ack

writes ‘P’; the DDRAM has been selected at power-up; the

cursor is incremented by 1 and shifted to the right

010100001

‘write data’ to DDRAM

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Ack

PH_

writes ‘H’

010010001

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