PCF2119DUSLASH2SLASH2 datasheet(66/79 Pages) NXP

66 / 79 page

PCF2119X_5

Product data sheet

Rev. 05 — 13 August 2009

66 of 79

NXP Semiconductors

PCF2119x

LCD controllers/drivers

16.14 User deﬁned characters and symbols

Up to 16 user deﬁned characters may be stored in the CGRAM. The content of the

CGRAM is lost during power-down, therefore the CGRAM has to be rewritten after every

power-on.

Below some source code is printed, which shows how a user deﬁned character is deﬁned

- in this case the euro currency sign. The display used is a 2 lines by 16 characters display

and the interface is the I2C-bus:

// Write a user defined character into the CGRAM

startI2C();

// PCF2119 slave address for write, SA0 is connected to Vdd

SendI2CAddress(0x70);

// MSB (Continuation bit Co) = 0, more than one byte may follow. Bit6, RS=0, next byte

// is command byte

i2c_write(0x00);

// 2 lines x 16, 1/18 duty, basic instruction set. Next byte will be another command.

i2c_write(0x24);

// Set CGRAM address to 0

i2c_write(0x40);

// Repeated Start condition

startI2C();

SendI2CAddress(0x70);

// RS=1, next byte is a data byte

i2c_write(0x40);

// Here the data bytes to define the character

// Behind the write commands the 5x8 dot matrix is shown, the 1 represents a on pixel.

// The Euro currency character can be recognized by the 0/1 pattern (see Figure 48)

i2c_write(0x06); // 00110

i2c_write(0x09); // 01001

i2c_write(0x08); // 01000

i2c_write(0x1E); // 11110

i2c_write(0x08); // 01000

i2c_write(0x09); // 01001

Fig 48. User deﬁned euro currency sign

000

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PCF2119DU/2/2 Datasheet(PDF) 66 Page - NXP Semiconductors

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