Sharp UP-3300 Service Manual page 59

3-6. Extended I/O area
The addresses from F00000h to FFFFFFh are called an extended I/O
area. The UP-3300 uses the following addresses as the break ad-
dress register (BAR) for SSP.
FFFF00h ∼ FFFFFFh
•
4. LCD display
The main display is a 640 × 480 dot liquid crystal display.
4-1. Block diagram
Here is the block diagram of the LCD and its allied components.
CPU
H8/510
RD-
WR-
WAITZ
WAIT-
MPCA8
VWAITZ
RFSH-
RESET-
4-2. LCD panel
The dot-matrix LCD unit LM10V33 with color STN and CCFT back
light is used for LCD panel. It provides 640 ×480 resolution.
4-3. Display controller
Matsushita VGAC (MN89303A) is used for display controller.
VRAM is on the address space of the CPU and data can be written
on and read from it by every 128 KB of bank at the address C00000H
∼ C1FFFFH from the CPU side. VRAM consists of 4 banks.
4-4. LCD ON control
The LCD's is bias power supply is controlled by the MN89303A ter-
minal LCDON to turn the LCD screen on and off.
The LCDON is at "L" at resetting +5V power is supplied to the LCD by
setting the expanded function control register bit5 of MN89303A to
"H" with software. The LCD screen isn't turned on until +5V is sup-
plied.
VCC
SD0~SD15
RAS/CAS
SA0~SA16
IORD-
ISP
MEMRD-
2032
IOWR-
MD0~MD15
MEMWR-
Φ
MA0~MA9
CLK
UD0~UD7
LD0~LD7
ISP
READY
2032
RFSH-
MN89393A
RESET
VCC
BACKON
VCC
RAS-/CAS-
WE-
WE-
VRAM
(DRAM512KB)
D0~D7
A0~A9
UD0~UD7
LD0~LD7
LP LP
(640 x 480)
FP YD
DCLK XCK
VCC
LOGIC
(LCD ON/OFF)
LCDON
+5V
OSC1
POWER
SUPPLY
OCS2
25MHz
(BACK LIGHT ON/OFF)
Fig. 7
4-5. Back light control
The back light is turned ON/OFF by the MN89303A terminal BACK-
ON. The initial value is "L" and the back light is off. By setting the
expanded function control register bit6 of MN89303A to "H", the in-
verter unit is turned on.
4-6. Luminance and contrast adjustment
•
Luminance: Luminance is adjusted with an inverter which has
dimming function.
•
Contrast: Contrast is adjusted by controlling the contrast ad-
justment voltage (VCON) of the LM10V33.
5. Customer display
The customer display uses the NEW TYPE 2 LINE vacuum fluores-
cent tube. The display is turned on and off by the CKDC9.
7 – 23
Contrast
LCD
Luminance
INVERTER
+12V