ST7558
Read status byte
Indicates the internal status of the ST7558
A0
0
D7
PD
D6
RST
D5
BUSY
D4
D
D3
E
D2
1
D1
0
D0
1
WR(R/W)
1
Flag
Description
PD=0:chip is active
PD
PD=1:chip is in power down mode
Indicates the initialization is in progress by RESET signal
0: chip is active,1:chip is being reset
RST
The device is busy when internal operation or reset. Any instruction is rejected until BUSY
goes LOW.
0:chip is active
1:chip is being busy
BUSY
D,E
D
0
0
1
1
E
0
1
0
1
The bits D and E select the display mode.
Display blank
All display segments on
Normal mode
Inverse video mode
D2~D0 ST7558 will return the fix data “101” as identification bit
Write data
8-bit data of Display Data from the microprocessor can be written to the RAM location specified by the column address and
page address. The column address is increased by 1 automatically so that the microprocessor can continuously write data
to the addressed page. During auto-increment, the column address wraps to 0 after the last column is written.
A0
1
D7
D6
D5
D4
D3
D2
D1
D0
WR(R/W)
0
Write data
H=”0”
Set VLCD range
VLCD range L/H select
A0
0
D7
0
D6
0
D5
0
D4
1
D3
0
D2
0
D1
0
D0
PRS
WR(R/W)
0
PRS=0:VLCD programming range LOW
PRS=1: VLCD programming range HIGH
Display Control
This bits D and E selects the display mode.
A0
0
D7
0
D6
0
D5
0
D4
0
D3
1
D2
D
D1
0
D0
E
WR(R/W)
0
Flag
Description
D
0
1
0
1
E
0
0
1
1
The bits D and E select the display mode.
Display off
Normal display
All display segments on
Inverse video mode
D,E
Ver 2.3
29/56
2005/10/05
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
