■ DESCRIPTION
The MB90091A is the multisync, on-screen display controller that supports a variety of TV systems such as NTSC, PAL, double-scan NTSC, double-scan PAL, 1250HDTV, and 1125HDTV as well as personal computer monitor display systems such as VGA and XGA. The MB90091A contains display memory (VRAM) and character font ROM, allowing characters to be displayed with few external devices. The device also contains command table ROM storing display command data, minimizing the load on the microcomputer.

■ FEATURES
• Screen display capacity : Up to 24 characters x 12 lines (288 characters)
• Font size : 24 x 32 dots (horizontal x vertical)
• Font types : 512 different characters (character codes 000H to 1FFH)
8 different sprite characters (character codes 1F8H to 1FFH)
(Internal or external ROM selectable)
• Display modes : Trimmed display (pattern background 0, 1, or none)
Character background (settable for each character)
Shaded background (settable for each character)
• Sprite character display : Capable of displaying one character (selectable from among 8 types of char
acters) on the screen
Sprite character colors : 8 colors
Sprite trimming colors : 8 colors
Sprite display position : Settable in 2-dot units on the screen
• Character sizes : Normal, double width, double height, double width x double height, quadruple
width, quadruple width x double height
(Set for each line)
• Display colors : Character color : 16 colors (set for each character)
Trimmed background color : 16 colors (set for each line)
Character background color : 16 colors (set for each character)
Screen background color : 16 colors
• Display position control : Horizontal display start position : Set in 8-dot units
Vertical display start position : Set in 2-dot units
Line spacing control : Set in 2-dot units (0 to 30 dots)
• Character/color signal output : ROUT, GOUT, BOUT, IOUT (color signals)
COLOR (color/monochrome control signal)
VOB1 (character + pattern background + character background + screen
background: all-output signal)
VOB2 (character + pattern background + character background: specified
character output signal)
• Supported TV systems : NTSC, PAL, double-scan NTSC, double-scan PAL, 1250HDTV, 1125HDTV, etc.
Personal computer monitor display systems such as VGA
• Intelligent features : Automatic control of operation using on command table ROM
Command table ROM: Internal 32K bytes + external 32K bytes available
• Microcontroller/microcomputer interface : 8-bit serial input (3 signal input pins
Chip select: SCS
Serial clock: SCLK
Serial data: SIN
• Package : SH-DIP-64, QFP-64
• Miscellaneous : Power-on reset circuit integrated