ST7038 datasheet(30/63 Pages) SITRONIX

30 / 63 page

ST7038

Ver 1.3

30/63

2008/05/27

Read Status

BF: Busy Flag

When BF is “H”, it indicates that the internal operation is processing. So the next instruction(s) cannot be accepted until

BF=”L”. Be sure to check BF bit before issuing next instruction. In serial interface mode (including I

2C mode), please use

delay to avoid the next instruction conflict with the internal operation.

AC: Address Counter

In parallel interface modes the Address Counter (AC) can be read by MPU on DB6~DB0. The AC stores DDRAM/CGRAM

address which is transferred from IR. After each byte access (read/write) with DDRAM/CGRAM, AC is adjusted by 1

automatically (increase or decrease is controlled by the setting of Entry Mode).

Write Data to CGRAM, DDRAM or ICON RAM

This operation writes binary 8-bit data to CGRAM, DDRAM or ICON RAM. The selection of RAM (DDRAM, CGRAM or ICON

RAM) is controlled by the previous “Set xxxxx Address” instruction (Set DDRAM Address, Set CGRAM Address, Set ICON

RAM Address).

RAM set instruction can also determine the AC direction to RAM.

After write operation, the address is adjusted by 1 automatically (increase or decrease is controlled by the setting of Entry

Mode).

Read Data from DDRAM, CGRAM or ICON RAM

This operation reads binary 8-bit data from DDRAM, CGRAM or ICON RAM. The selection of RAM (DDRAM, CGRAM or

ICON RAM) is controlled by the previous “Set xxxxx Address” instruction. Make sure the selected RAM (DDRAM, CGRAM or

ICON RAM) is correct before read data operation.

Instruction Table 0, IS[1:0]=(0,0)

Cursor or Display Shift

This instruction is different from the “Entry Mode Set” instruction. The shift is performed immediately right after receiving this

instruction. The data search or data correction in applications can be easily achieved by using screen and cursor shift.

S/C

R/L

Description

AC Value

Shift cursor left.

AC=AC-1

Shift cursor right.

AC=AC+1

Shift Screen (current display) left.

Cursor follows the screen to shift left.

AC=AC

Shift Screen (current display) right.

Cursor follows the screen to shift right.

AC=AC

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