LCD Driver Technical Manual

SED1520 Series
2–16 EPSON
Set Column Address
This command specifies a column address of the display data RAM. When the display data RAM is accessed by the MPU
continuously, the column address is incremented by 1 each time it is accessed from the set address. Therefore, the MPU
can access to data continuously. The column address stops to be incremented at address 80, and the page address is not
changed continuously.
This command loads the column address register.
Read Status
Reading the command I/O register (A0=0) yields system status information.
• The busy bit indicates whether the driver will accept a command or not.
Busy=1: The driver is currently executing a command or is resetting. No new command will be accepted.
Busy=0: The driver will accept a new command.
• The ADC bit indicates the way column addresses are assigned to segment drivers.
ADC=1: Normal. Column address n → segment driver n.
ADC=0: Inverted. Column address 79-u → segment driver u.
• The ON/OFF bit indicates the current status of the display.
It is the inverse of the polarity of the display ON/OFF command.
ON/OFF=1: Display OFF
ON/OFF=0: Display ON
• The RESET bit indicates whether the driver is executing a hardware or software reset or if it is in normal operating mode.
RESET=1: Currently executing reset command.
RESET=0: Normal operation
Write Display Data
Writes 8-bits of data into the display data RAM, at a location specified by the contents of the column address and page
address registers and then increments the column address register by one.
R/W
A
0 RD WR D7 D6 D5 D4 D3 D2 D1 D0
0 0 1 BUSY ADC ON/OFF RESET 0000
R/W
A
0 RD WR D7 D6 D5 D4 D3 D2 D1 D0
1 1 0 Write data
R/W
A
0 RD WR D7 D6 D5 D4 D3 D2 D1 D0
0100A6 A5 A4 A3 A2 A1 A0 00H to 4FH
A6 A5 A4 A3 A2 A1 A0 Column Address
0000000 0
0000001 1
::
::
1001111 79