ML9042 datasheet(32/58 Pages) OKI

32 / 58 page

FEDL9042-01

OKI Semiconductor

ML9042-xx

32/58

Instruction Codes

An instruction code is a signal sent from the CPU to access the ML9042. The ML9042 starts operation as

instructed by the code received. The busy status of the ML9042 is rather longer than the cycle time of the CPU,

since the internal processing of the ML9042 starts at a timing which does not affect the display on the LCD. In the

busy status (Busy Flag is “1”), the ML9042 cannot input the Busy Flag Read instruction only. Therefore, the CPU

should ensure that the Busy Flag is “0” before sending an instruction code to the ML9042.

1) Display Clear

RS1

RS0

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

Instruction Code:

When this instruction is executed, the LCD display including arbitrator display is cleared and the I/D entry

mode is set to “Increment”. The value of “S” (Display shifting) remains unchanged. The position of the cursor

or blink being displayed moves to the left end of the LCD (or the left end of the line 1 in the 2-line display

mode).

Note:

All DDRAM and ABRAM data turn to “20” and “00” in hexadecimal, respectively. The value of the

address counter (ADC) turns to the one corresponding to the address “00” (hexadecimal) of the

DDRAM.

The execution time of this instruction is 1.52 ms (maximum) at an oscillation frequency of 270 kHz.

2) Cursor Home

RS1

RS0

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

Instruction code:

×: Don’t Care

When this instruction is executed, the cursor or blink position moves to the left end of the LCD (or the left end

of line 1 in the 2-line display mode). If the display has been shifted, the display returns to the original display

position before shifting.

Note:

The value of the address counter (ADC) goes to the one corresponding to the address “00”

(hexadecimal) of the DDRAM).

The execution time of this instruction is 1.52 ms (maximum) at an oscillation frequency of 270 kHz.

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