PCF2104CUSLASH7 datasheet(37/56 Pages) MOTOROLA

37 / 56 page

1997 Dec 16

Philips Semiconductors

Product speciﬁcation

LCD controller/driver

PCF2104x

Table 6

4-bit operation, 1-line display example; using internal reset

STEP

INSTRUCTION

DISPLAY

OPERATION

Power supply on (PCF2104x is

initialized by the internal reset circuit).

Initialized. No display appears.

Function set:

RS = 0; R/W = 0; DB7 = 0; DB6 = 0;

DB5 = 1; DB4 = 0

Sets to 4-bit operation. In this instance operation is

handled as 8-bits by initialization and only this

instruction completes with one write.

Function set:

RS = 0; R/W = 0; DB7 = 0; DB6 = 0;

DB5 = 1; DB4 = 0

Sets to 4-bit operation, selects 2

× 12 display.

RS = 0; R/W = 0; DB7 = 0; DB6 = 0;

DB5 = 0; DB4 = 0

4-bit operation starts from this point and resetting is

needed.

Display on/off control:

RS = 0; R/W = 0; DB7 = 0; DB6 = 0;

DB5 = 0; DB4 = 0

Turns on display and cursor.

RS = 0; R/W = 0; DB7 = 1; DB6 = 1;

DB5 = 1; DB4 = 0

Entire display is blank after initialization.

Entry mode set:

RS = 0; R/W = 0; DB7 = 0; DB6 = 0;

DB5 = 0; DB4 = 0

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

cursor to the right at the time of write to the DD/CGRAM.

RS = 0; R/W = 0; DB7 = 0; DB6 = 1;

DB5 = 1; DB4 = 0

Display is not shifted.

Write data to CGRAM/DDRAM:

RS = 1; R/W = 0; DB7 = 0; DB6 = 1;

DB5 = 0; DB4 = 1

Writes ‘P’. The DDRAM has already been selected by

initialization at power-on.

RS = 1; R/W = 0; DB7 = 0; DB6 = 1;

DB5 = 1; DB4 = 0

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

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