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參數(shù)資料
| 型號(hào)： | LC74723M |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | On-Screen Display Controller |
| 中文描述： | 屏幕顯示控制器 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 144K |
| 代理商： | LC74723M |
Second byte
Note: The register states are all set to zero when the LC74723 is reset with the RST pin.
5. COMMAND4 (Display control command)
First byte
Second byte
Note: The register states are all set to zero when the LC74723 is reset with the RST pin.
No. 4841-9/12
LC74723, 74723M
DA
0 to 7
Register
name
Contents
Remarks
State
Function
7
—
0
Second byte identification code
6
LC
0
1
An LC oscillator is used for the dot clock
A crystal oscillator is used for the dot clock
If HS is the horizontal display start position then:
Selects the dot clock used for horizontal
direction character display.
5
HP5
(MSB)
0
1
4
HP4
0
1
3
HP3
0
1
2
HP2
0
1
1
HP1
0
1
0
HP0
(LSB)
0
1
DA
0 to 7
Register
name
Contents
Remarks
State
Function
7
—
1
6
—
1
Command 4 identification code
Set display control.
5
—
0
4
—
0
3
TSTMOD
0
Normal operating mode
This bit must be zero.
1
Test mode
2
RAMERS
0
The RAM erase operation requires about
500 μs (It is executed in the DSPOFF state.)
1
Erase display RAM (set to 3F hexadecimal)
1
OSCSTP
0
Do not stop the crystal oscillator or LC oscillator circuits.
Valid when character display is off in external
synchronization mode.
1
Stop the crystal oscillator or LC oscillator circuits.
0
SYSRST
0
Reset occurs when the CS pin is low, and
the reset is cleared when CS is high.
1
Reset all registers and turn the display off.
DA
0 to 7
Register
name
Contents
Remarks
State
Function
7
—
0
Second byte identification code
6
EGL
0
Trimming level 0 (V
BK0
)
Trimming level 1 (V
BK1
)
Interlace (256.5 H per field)
Trimming level switching
1
5
NON
0
Interlace/non-interlace switching
1
Non-interlace (263 H per field)
4
EG
0
Trimming off
1
Trimming on
3
BK1
0
Blinking period: about 0.5 s
Blinking state switching
1
Blinking period: about 1.0 s
0
Blinking off
When blinking is specified for reversed
characters, the blinking will be between normal
character and reversed character display.
2
BK0
1
Blinking on
1
RV
0
Reverse (character reversing) off
1
Reverse (character reversing) on
0
DSPON
0
Character display off
1
Character display on
Tc: The oscillator period of the OSCIN and
OUT pin oscillator in operating mode
HS = Tc
×
(2
n
HP
n
)
n = 0
5
The horizontal display start position is set by
the 6 bits HP0 to HP5.
The weight of the low-order bit is 2Tc.
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