參數(shù)資料
型號: LC74783
廠商: Sanyo Electric Co.,Ltd.
英文描述: On-Screen Display Controller LSI for VCR Products(用于錄象機的屏幕顯示控制器的大規(guī)模集成電路(LSI))
中文描述: 屏幕顯示控制器芯片的錄像機產(chǎn)品(用于錄象機的屏幕顯示控制器的大規(guī)模集成電路(LSI)的)
文件頁數(shù): 10/15頁
文件大小: 181K
代理商: LC74783
{
COMMAND3 (Horizontal display start position and horizontal character size setup command)
First byte
Second byte
Note: The register states are all set to zero when the LC74783/M is reset with the RST pin.
|
COMMAND4 (Display control setup command)
First byte
No. 4990-10/15
LC74783, 74783M
Register content
DA0 to DA7
Register name
State
Function
Note
7
1
6
0
Command 3 identification code
Set the horizontal display start position and horizontal
character size.
5
1
4
1
3
HS21
0
1
Second line horizontal character size
2
HS20
0
1
1
HS11
0
1
First line horizontal character size
0
HS10
0
1
HS21
HS20
0
1
0
1 Tc per dot
2 Tc per dot
1
3 Tc per dot
1 Tc per dot
HS11
HS10
0
1
0
1 Tc per dot
2 Tc per dot
1
3 Tc per dot
1 Tc per dot
Register content
DA0 to DA7
Register name
State
Function
Note
7
0
Second byte identification bit
6
LC
0
An LC oscillator is used for the dot clock.
Selects the dot clock used in horizontal
character display.
1
A crystal oscillator is used for the dot clock.
5
HP5
(MSB)
0
If HS is the horizontal start position then:
1
5
4
HP4
0
HS = Tc
×
(2
2
n
HP
n
)
1
n = 0
3
HP3
0
1
2
HP2
0
1
1
HP1
0
1
0
HP0
(LSB)
0
1
The horizontal display start position is
set by the six bits HP5 to HP0.
The weight of bit 1 is 2Tc.
Tc: Period of the oscillator connected to OSCIN/OSCOUT in
operating mode.
Register content
DA0 to DA7
Register name
State
Function
Note
7
1
6
1
Command 4 identification code
Display control
5
0
4
0
3
TSTMOD
0
Normal operating mode
This bit must be zero.
1
Test mode
0
The RAM erase operation requires about
500 μs (It is executed in the DSPOFF
state.)
2
RAMERS
1
Erase display RAM (set to 7F hexadecimal)
1
OSCSTP
0
Do not stop the crystal oscillator and LC oscillator circuits.
Valid when character display is off in
external synchronization mode.
1
Stop the crystal oscillator and LC oscillator circuits.
0
SYSRST
0
Reset occurs when the CS pin is low, and
the reset is cleared when CS goes high.
1
Reset all registers and turn the display off.
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