ST7036 datasheet(17/70 Pages) SITRONIX

17 / 70 page

ST7036

V1.7a

2007/10/17

17/70

The Instruction register(IR) is used only to store instruction code transferred from MPU. MPU cannot use it to

read instruction data.

To select register, use RS bit input in IIC interface.

Table 2. Various kinds of operations according to RS and R/W bits.

Busy Flag (BF)

When BF = "High”, it indicates that the internal operation is being processed. So during this time the next

instruction cannot be accepted. BF can be read, when RS = Low and R/W = High (Read Instruction Operation),

through DB7 port. Before executing the next instruction, be sure that BF is not High.

Address Counter (AC)

Address Counter(AC) stores DDRAM/CGRAM/ICON RAM address, transferred from IR.

After writing into (reading from) DDRAM/CGRAM/ICON RAM, AC is automatically increased (decreased) by 1.

When RS = "Low" and R/W = "High", AC can be read through DB0 ~ DB6 ports.

Display Data RAM (DDRAM)

Display data RAM (DDRAM) stores display data represented in 8-bit character codes. Its extended capacity is 80

x 8 bits, or 80 characters. The area in display data RAM (DDRAM) that is not used for display can be used as

general data RAM. See Figure 6 for the relationships between DDRAM addresses and positions on the liquid

crystal display.

The DDRAM address (ADD ) is set in the address counter (AC) as hexadecimal.

1-line display (N3=0,N = 0) (Figure 7)

When there are fewer than 80 display characters, the display begins at the head position. For

example, if using only the ST7036, 20 characters are displayed. See Figure 7.

When the display shift operation is performed, the DDRAM address shifts. See Figure 8.

RS R/W

Operation

Instruction Write operation (MPU writes Instruction code into IR)

Data Write operation (MPU writes data into DR)

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