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參數(shù)資料
| 型號： | LC74723 |
| 元件分類： | 畫面疊加 |
| 英文描述： | ON-SCREEN DISPLAY IC, PDIP24 |
| 封裝： | 0.300 INCH, PLASTIC, SDIP-24 |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 245K |
| 代理商： | LC74723 |
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
Register
Contents
Remarks
0 to 7
name
State
Function
7—
0
Second byte identification code
6LC
0
An LC oscillator is used for the dot clock
Selects the dot clock used for horizontal
1A crystal oscillator is used for the dot clock
direction character display.
5
HP5
0
(MSB)
1
4
HP4
0
1
3
HP3
0
1
2
HP2
0
1
HP1
0
1
0
HP0
0
(LSB)
1
DA
Register
Contents
Remarks
0 to 7
name
State
Function
7—
1
6—
1
Command 4 identification code
5—
0
Set display control.
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
1
Erase display RAM (set to 3F hexadecimal)
500 s (It is executed in the DSPOFF state.)
1
OSCSTP
0
Do not stop the crystal oscillator or LC oscillator circuits.
Valid when character display is off in external
1
Stop the crystal oscillator or LC oscillator circuits.
synchronization mode.
0
SYSRST
0
Reset occurs when the CS pin is low, and
1
Reset all registers and turn the display off.
the reset is cleared when CS is high.
DA
Register
Contents
Remarks
0 to 7
name
State
Function
7—
0
Second byte identification code
6
EGL
0
Trimming level 0 (VBK0)
Trimming level switching
1
Trimming level 1 (VBK1)
5
NON
0
Interlace (256.5 H per field)
Interlace/non-interlace switching
1
Non-interlace (263 H per field)
4EG
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
2
BK0
characters, the blinking will be between normal
1
Blinking on
character and reversed character display.
1RV
0
Reverse (character reversing) off
1
Reverse (character reversing) on
0
DSPON
0
Character display off
1
Character display on
If HS is the horizontal display start position then:
Tc: The oscillator period of the OSCIN and
OUT pin oscillator in operating mode
HS = Tc × (2Σ 2n HPn)
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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