PCF8820 datasheet(37/60 Pages) PHILIPS

37 / 60 page

2000 Dec 07

Philips Semiconductors

Product speciﬁcation

× 101 Grey-scale/ECB colour dot matrix

LCD driver

PCF8820

13 APPLICATION INFORMATION

13.1

Programming example for the PCF8820

It should be noted that only a part of the LCD is shown in the LCD column of Table 9.

Table 9

Programming example

STEP

SERIAL BUS BYTE

LCD

OPERATION

DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

01111

SA1 SA0

start slave address, R/W=0

10000000

control byte: Co = 1, RS = 0

00000001

H2 to H0 independent command:

select function and RAM command

page (H2 to H0 = 000)

10000000

control byte: Co = 1, RS = 0

00001001

function and RAM command page:

select display setting command

page (H2 to H0 = 001)

10000000

control byte: Co = 1, RS = 0

00000110

display setting command page: set

normal display mode (D = 1, E = 0)

10000000

control byte: Co = 1, RS = 0

00010010

display setting command page: set

bias system = 1/9

(BS2 to BS0 = 010)

10000000

control byte: Co = 1, RS = 0

01000000

display setting command page:

select ﬁrst 8 rows for partial screen

mode (DP2 to DP0 = 000)

10000000

control byte: Co = 1, RS = 0

00000001

H2 to H0 independent command:

select function and RAM command

page (H2 to H0 = 000)

10000000

control byte: Co = 1, RS = 0

00010110

function and RAM command page:

select Power-down mode (PD = 1)

and vertical address mode (V = 1)

10000000

control byte: Co = 1, RS = 0

00001100

function and RAM command page:

select special feature command

page (H2 to H0 = 100)

10000000

control byte: Co = 1, RS = 0

00000101

special feature command page:

enable display (DOF = 0) and

enable direct drive (DM = 1) to

pre-charge the charge pump

10000000

control byte: Co = 1, RS = 0

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