AN3114 datasheet(31/43 Pages) STMICROELECTRONICS

31 / 43 page

AN3114

Displaying alphanumeric characters on the LCD glass

Doc ID 16829 Rev 3

31/43

In medium+ and high density STM8L152xx/STM8L162xx devices, the LCD RAM is

accessed through two pages, each activated by the PAGE_COM bit in the LCD_CR4

–

When PAGE_COM = 0: the LCD RAM register address gives access to the first

LCD RAM page, selecting COM0, 1, 2 and 3.

–

When PAGE_COM = 1: the LCD RAM register address gives access to the

second LCD RAM page, selecting COM4, 5, 6 and 7.

The LCD segments are individually controlled by selecting the dedicated page and setting or

clearing the corresponding bit of the LCD data registers (LCD_RAM[21:0]).

The LCD controller module handles the encoding of the physical drive waveforms to the

custom LCD Glass HXO5002B.

The physical connections between custom LCD HXO5200B and the LCD controller

available on the medium+ density STM8L152xx devices and on high density

STM8L152xx/STM8L162xx devices must be performed as shown in Figure 22.

Figure 22.

HXO5002B LCD daughterboard

The physical connections between each pixel, the segment lines and the common lines

must be performed as shown in Table 5.

AN3114 Datasheet(PDF) 31 Page - STMicroelectronics