AN3114 datasheet(28/43 Pages) STMICROELECTRONICS

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Displaying alphanumeric characters on the LCD glass

AN3114

28/43

Doc ID 16829 Rev 3

Displaying a “W” on the LCD glass

The LCD segments B, C, E, F, L, and N must be activated to display the “W” letter (see

Figure 20). These segments must then be transferred from the LCD_RAM registers to the

LCD glass. Use the matrix described in Figure 19 to know which bits of the LCD_RAM

registers must be set.

The firmware structure provides the value 0x05D2 for Nibble[3:0], corresponding to:

●

Nibble[0] = 0x0 = 0000b

●

Nibble[1] = 0x5 = 0101b

●

Nibble[2] = 0xD = 1101b

●

Nibble[3] = 0x2h = 0010b.

To display ‘W’ on position three on the LCD glass, the LCD_RAM registers must be

programmed as follows:

●

Nibble[0] in the MSB bits for LCD_RAM1 register

●

Nibble[1] in the LSB bits for the LCD_RAM5 register

●

Nibble[2] in the MSB bits for the LCD_RAM8 register

●

Nibble[3] in the LSB bits for the LCD_RAM12 register

Note:

All upper case letters and number are converted from ASCII characters to LCD_RAM

registers format. The LCD letters and numbers map are stored in two Flash tables

(LetterMap and NumberMap) as constants which are used when translating the ASCII

characters to LCD RAM registers.

Table 3.

LCD_RAM bits versus LCD PD-878 characters

LCD RAM

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

LCD_RAM0

Character1

Character0

LCD_RAM1

Character3

Character2

LCD_RAM2

Character5

Character4

LCD_RAM3

Character0

Character6

LCD_RAM4

Character2

Character1

LCD_RAM5

Character4

Character3

LCD_RAM6

Character6

Character5

LCD_RAM7

Character1

Character0

LCD_RAM8

Character3

Character2

LCD_RAM9

Character5

Character4

LCD_RAM10

Character0

Character6

LCD_RAM11

Character2

Character1

LCD_RAM12

Character4

Character3

LCD_RAM13

Character6

Character5

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