STV9936S datasheet(20/48 Pages) STMICROELECTRONICS

20 / 48 page

Character Specifications

STV9936P/S

20/48

The range of the vertical height is from 18 to 127 lines.

CH[6:0] = Number of scan lines used to display the characters

The characters stored in ROM are coded on 18 lines. If bits CH[6:0] are programmed with a value

less than 18, the characters will be automatically displayed with a height of 18 scan lines (minimum

value).

When a multiple of 18 scan lines are displayed, all ROM lines are repeated N number of times, with

N in the range of 1 to 7, so as not to exceed the display of 127 scan lines. For example, if CH[6:0] =

36, each ROM line is repeated twice.

If the number of scan lines displayed is not a multiple of 18, certain ROM lines are repeated more

often than others, as shown in Table 21. For example, if CH[6:0] = 40, each ROM line is repeated

twice and ROM lines 3, 7, 10 and 14 are repeated three times.

Table 21 shows which ROM lines, from 0 to 17, are repeated depending on the CH[6:0] value.

4.4

Row Height (Space Lines)

The row height defines the number of scan lines above and below each character row. This value is

selected by bits RSPA[4:0]. The total row height is defined as follows:

Row_Height = Character_Height + 2 x Space_Lines (see Figure 8)

Table 21: Repeated ROM Lines1

1. ‘R’ = Repeated ROM lines

‘A’ = Number of additional repeated lines

CH Value

012

345

678

18, 36, 54, 72, 90, 108, 126

19, 37, 55, 73, 91, 109, 127

20, 38, 56, 74, 92 ,110,

21, 39, 57, 75, 93, 111

22, 40, 58, 76, 94, 112

23, 41, 59, 77, 95, 113

24, 42, 60, 78, 96, 114

RRRRRR

25, 43, 61, 79, 97, 115

26, 44, 62, 80, 98, 116

27, 45, 63, 81, 99, 117

28, 46 ,64, 82, 100, 118

29, 47, 65, 83, 101, 119

30, 48, 66, 84, 102, 120

31, 49, 67, 85, 103, 121

32, 50, 68, 86, 104, 122

33, 51, 69, 87, 105, 123

34, 52, 70, 88, 106, 124

RRR

RRRR

RRR

35, 53, 71, 89, 107, 125

RRR

RRRR

RRR

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