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參數(shù)資料
| 型號： | 20749 |
| 英文描述： | Configuring the ?lanSC300 Device＇s Internal CGA Controller for a Specific LCD Panel |
| 中文描述： | 配置？lanSC300設備的內部海巡署控制器，用于特定的液晶面板 |
| 文件頁數(shù)： | 11/26頁 |
| 文件大?。?/td> | 277K |
| 代理商： | 20749 |
Configuring the élanSC300 Device’s Internal CGA Controller for a Specific LCD Panel
11
HGA Text
Initially, the Video Index registers are accessed by writ-
ing the register index to Port 3D4h, and then writing or
reading the register data to or from Port 3D5h. This oc-
curs until the controller is switched to HGA mode. After
this occurs, Port 3B4 is used for the index and Port 3B5
is used for the data.
1. Set Video Index 18H = 51h (Use ports 3D4 and
3D5)
– Sets Graphics mode to HGA (from now on use
Ports 3B4 and 3B5)
– Sets up LCD panel type to single screen (bits 7
and 6)
– Sets display type to LCD (bit 4)
2. Set Video Index 00H =
HT
3. Set Video Index 01H = HT
4. Set Video Index 02H = 0
5. Set Video Index 03H = 0
6. Set Video Index 04H = VT
7. Set Video Index 05H = 0
8. Set Video Index 06H = VT
9. Set Video Index 07H = VT
10.Set Video Index 08H = 0
11.Set Video Index 09H = MSL
12.Set Video Index 0AH = CS
13.Set Video Index 0BH = CE
14.Set Video Index 0CH = SAH
15.Set Video Index 0DH = SAL
16.Set Video Index 0EH = CAH
17.Set Video Index 0FH = CAL
18.Set Video Port 3BFH = 00H
– Master disable for Graphics mode
19.Set Video Port 3B8H = 08H
– Enable video display
DUAL-SCREEN LCD SUPPORT
The élanSC300 microcontroller supports only one type
of dual-screen LCD display. The display must be 640 x
200 (640 x 100 per panel). The display must accept 8
data bits total (4 data bits per panel). The élanSC300
microcontroller will support the panel in CGA mode
only and refresh the display at a rate of approximately
75 Hz.
The reason for the limited dual-screen support is that
the élanSC300 microcontroller does not have any
dual-screen registers that, among other things, allow
you to program where the fetching of data for the
lower panel should begin. This was hard-wired in the
élanSC300 microcontroller.
Programming the élanSC300
Microcontroller for Dual-Screen LCD
Support
The programming values for this dual-screen LCD are
identical to the ones used for the single-screen panel
with two exceptions. Video Index 18H bits 7 and 6
should be set to 00 instead of 01. The élanSC300 mi-
crocontroller Configuration Register B1H bit 1 must be
set to 1 to enable the additional 4 lower-panel LCD data
bits.
The Physical Pin Connections to the
élanSC300 Microcontroller
To connect an LCD panel to the élanSC300 microcon-
troller, the following pins need to be connected:
LCDD3–LCDD0
: These are the panel’s data bits.
LCDD3 is the MSB; LCDD0 is the LSB. Find out which
data bit on the LCD is the MSB, which is the LSB, and
connect the pins accordingly.
CP1
: Also known as the line clock or latch (see defini-
tion in "Line Clock (CP1)" on page 2). This should be
connected to the equivalent line on the LCD panel.
CP2
: Also known as the shift clock or data shift (see
definition in "Shift Clock (CP2)" on page 2). This should
be connected to the equivalent line on the LCD panel.
FRM
: Also known as FLM, or frame (see definition in
"Frame Start (FRM)" on page 2). This should be con-
nected to the equivalent line on the LCD panel.
M
: AC modulation (see definition in "LCD Panel AC
Modulation (M)" on page 2). Some panels require this
signal, others do not. Connect this signal if appropriate.
LCDDL3–LCDDL0
: These data bits are required only
if a dual-screen LCD panel is being connected. These
are the data bits for the lower panel. LCDDL3 is the
MSB for the lower panel, and LCDDL0 is the LSB for
the lower panel.
Other LCD pin connections
The other connections that need to be made to an LCD
vary. For example:
I
Contrast voltage
: can be positive or negative, typ-
ically about –22 volts.
I
+5 V
I
GND
I
Display enable
: This is usually a simple 5-V enable
signal that some panels require. This can easily be
connected to one of the élanSC300 microcontrol-
ler’s PMC pins.
I
V
ee
: Typically a voltage in the same range as the
contrast voltage. Refer to panel specifications.
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