STV9937 datasheet(20/49 Pages) STMICROELECTRONICS

20 / 49 page

Character Specifications

STV9937

20/49

Character Specifications

4.1

General Description

There are:

●

496 monochrome characters and 16 multi-color characters in ROM

●

32 to 127 characters per line

●

character height varies between 18 and 127 scan lines

●

0 to 62 scan space lines between character rows, with the same number of lines above and

below the rows of characters.

With the possibility to select:

●

blinking effect for each character

●

shadowing effect for characters in each window

●

background and foreground character colors: for each character, among a Color-shop of 8

Color-boxes per window. There is a Color-shop for each window. The Color-boxes define the

background colors and the foreground character colors and blinking effect.

4.2

Horizontal Resolution

The horizontal resolution defines the number of pixels per line expressed in characters unit. This

value is selected by bits HR[6:0].

The range of the horizontal resolution is from 32 to 127 characters, in steps of one character each.

The default value is 32 characters per line (20h). If bits HR[6:0] are programmed with a value less

than 32, the horizontal resolution will be 32 characters per line (minimum value).

HR[6:0] = Number of characters per line

It is important that the maximum pixel frequency must be respected (CLK2= 120 MHz maximum).

As each character is 12 pixels long, the number of pixels per line varies from 384 to 1524. For more

information, refer to Section 6: Pixel Clock Generator on page 29.

4.3

Character Height

The vertical height defines the number of scan lines used to display the characters. This value is

selected by bits CH[6:0].

Table 19: Horizontal Resolution

FWR

FAC

Default

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

80h

01h

20h

HR[6:0]

Table 20: Vertical Character Height

FWR

FAC

Default

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

80h

02h

12h

CH[6:0]

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