AN3114 datasheet(30/43 Pages) STMICROELECTRONICS

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Displaying alphanumeric characters on the LCD glass

AN3114

30/43

Doc ID 16829 Rev 3

4.4

Connecting the custom LCD glass HXO5002B to the LCD

controller available in medium+ density STM8L152xx and

high density STM8L152xx/STM8L162xx devices

To display an alphanumeric character on the custom LCD glass display HXO5002B

available in medium+ density STM8L152xx and high density STM8L152xx/STM8L162xx

devices, six common lines (COM) and three segment lines (SEG) are required. The

selected COM from the eight available COM in medium+ and high density

STM8L152xx/STM8L162xx devices used on the STM8L1528-EVAL are COM0, COM1,

COM4, COM5, COM6 and COM7. Table 4 shows the correspondence between the LCD

controller available in medium+ density STM8L152xx and high density

STM8L152xx/STM8L162xx device segment lines, the LCD segment in the LCD RAM and

the reference letter for each alphanumeric character on the LCD glass.

Note:

“n” values can be (25, 28, 33, 36, 39 and 42) respectively for alphanumeric character

numbers (7, 6, 4, 3, 2 and 1).

This reference table covers all alphanumeric character, except the alphanumeric character

number 5 that is managed by the segment (24, 31 and 32).

Table 4.

Reference letter for an alphanumeric character on custom LCD

HXO5002B

Couple (COM/SEG)

LCD segment in LCD RAM

Reference letter for an

alphanumeric character

COM0/SEG(n)

LCD segment(n)

COM0/SEG(n+1)

LCD segment(n+1)

COM0/SEG(n+2)

LCD segment(n+2)

COM1/SEG(n)

LCD segment(n+40)

COM1/SEG(n+1)

LCD segment(n+1+40)

COM1/SEG(n+2)

LCD segment(n+2+40)

COM4/SEG(n)

LCD segment(n)

COM4/SEG(n+1)

LCD segment(n+1)

COM4/SEG(n+2)

LCD segment(n+2)

COM5/SEG(n)

LCD segment(n+40)

COM5/SEG(n+1)

LCD segment(n+1+40)

COM5/SEG(n+2)

LCD segment(n+2+40)

COM6/SEG(n)

LCD segment(n+80)

COM6/SEG(n+1)

LCD segment(n+1+80)

COM6/SEG(n+2)

LCD segment(n+2+80)

COM7/SEG(n)

LCD segment(n+120)

COM7/SEG(n+1)

LCD segment(n+1+120)

COM7/SEG(n+2)

LCD segment(n+2+120)

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