26 LCD CONTROLLER (LCDC)
S1C33L26 TECHNICAL MANUAL
Seiko Epson Corporation
26-1
LCD Controller (LCDC)
26
LCDC Module Overview
26.1
The S1C33L26 has a built-in LCD controller (LCDC) that supports 4/8-bit monochrome and color LCD panels,
and 12/16/24-bit Generic HR-TFT panels. Also the S1C33L26 contains a 20K-byte VRAM (IVRAM) allowing a
320
×
240-dot 4-color/gray scale screen (2-bpp mode) to be displayed. Furthermore, the bus controller (SRAMC,
SDRAMC) allows the LCDC to access the external SDRAM/SRAM as a VRAM, thus a 320
×
240-dot screen
with 24-bpp color depth (16M colors) can be displayed. The LCDC provides support for Picture-in-Picture Plus (a
variable size overlay window). The LCDC can use both the IVRAM and external VRAM, this makes it possible to
manages the main and sub (PIP) window display data in different memories.
The features of the LCDC are described below.
Internal bus interface and VRAM
• The UMA (Unified Memory Access) method using the Bus Arbiter and IVRAM interface is implemented.
This method allows the LCDC to access SDRAM/SRAM (external VRAM) while the CPU is accessing an
internal circuit, or to access IVRAM (internal VRAM) while the CPU is accessing another circuit.
• The LCDC registers are mapped into area 6 and 32-bit accesses are possible.
• The 20K-byte internal VRAM (IVRAM) is mapped at addresses 0x90000 to 0x94fff.
• The external VRAM map is configurable.
• The frame interrupt signal is output to the ITC.
Display support
• 4- or 8-bit monochrome LCD interface
• 4- or 8-bit color LCD interface
• Single-panel, single-drive passive displays
• 12-, 16- or 24-bit Generic HR-TFT interface
• Typical resolutions
320
×
240 (24-bpp mode, external VRAM is required)
bpp = bits per pixel
320
×
240 (2-bpp mode)
* Note that the panel width must be a multiple of (16
÷
bpp).
Display modes
• Due to frame rate modulation, gray scale display is possible in up to 16 shades of gray when a monochrome
passive LCD panel is used.
Two-shade display in 1-bpp mode
Four-shade display in 2-bpp mode
16-shade display in 4-bpp mode
• A maximum of 4K colors can be simultaneously displayed on a color passive LCD panel.
Two-color display in 1-bpp mode
Four-color display in 2-bpp mode
16-color display in 4-bpp mode
256-color display in 8-bpp mode
4K-color display in 12- and 16-bpp mode
• A maximum of 16M colors can be simultaneously displayed on a TFT panel.
Two-color display in 1-bpp mode
Four-color display in 2-bpp mode
16-color display in 4-bpp mode
256-color display in 8-bpp mode
4K-color display in 12-bpp mode
64K-color display in 16-bpp mode
16M-color display in 24-bpp mode