DDRAM Address Set

This instruction places the 7-bit DDRAM address specified by DB6~DB0 into the cursor position. Subsequent data

writes (reads) will be to (from) the DDRAM. The DDRAM and CGRAM contents are not affected by this instruction.

Valid DDRAM Address Ranges

Number of Character

Address Range

1st line

40

00H~27H

2nd line

40

40H~67H

When resetting: Don

¢t care.

Read Busy Flag and Address

This instruction reads the Busy Flag (BF)* and the value of address counter in binary

²AAAAAAA². This address coun-

ter is used by the CGRAM and DDRAM addresses, its value is determined by the previous instruction. The address

counter contents are the same as for instructions

²CGRAM address set² and ²DDRAM address set².

Note:

²*² means the Busy Flag (BF) always outputs a ²0².

Write Data to the CGRAM or DDRAM

This instruction writes the 8-bit data byte on DB7~DB0 into the DDRAM or CGRAM location addressed by the cursor

position. The most recent DDRAM or CGRAM Address Set instruction determines whether the write is to the DDRAM

or CGRAM. This instruction also increments or decrements the cursor position and shifts the display according to the

I/D and S bits set by the Entry Mode Set instruction.

Read Data from CGRAM or DDRAM

This instruction reads the 8-bit data byte from the DDRAM or CGRAM location addressed by the cursor position on

DB7~DB0. The most recent DDRAM or CGRAM Address Set instruction determines whether the read is from the

DDRAM or CGRAM. This instruction also increments or decrements the cursor position and shifts the display accord-

ing to the I/D and S bits set by the Entry Mode Set instruction. Before sending this instruction, a DDRAM or CGRAM Ad-

dress Set instruction should be executed to set the cursor position to the desired DDRAM or CGRAM address to be

read.

After reading one data, the value of the address is automatically increased or decreased by 1 according to the selection

by

²Entry mode².

Note:

The Address counter is automatically increased or decreased by 1 after a data write instruction to the CGRAM

or DDRAM are executed. But at this moment the data to be pointed to by the address counter cannot be read if

a data read instruction is executed. Therefore, to read data correctly, executing an address set instruction or

cursor shift instruction (the only case of a DDRAM data read) just before reading, or reading the second data in

case of reading data continuously by executing a read data instruction.

HT16514

Rev. 1.00

34

October 4, 2006