ST7032
l 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 7 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.
Ø 1-line display (N = 0) (Figure 8)
When there are fewer than 80 display characters, the display begins at the head position. For example, if
using only the ST7032, 16 characters are displayed. See Figure 8.
When the display shift operation is performed, the DDRAM address shifts. See Figure 9.
High order bits Low order bits
Example : DDRAM Address 4F
AC6 AC5 AC4 AC3 AC2 AC1 AC0
1001111
Figure 7. DDRAM Address
Display Position (digit)
123456
DDRAM Address 00 01 02 03 04 05
........
78 79 80
4D 4E 4F
Figure 8. 1-Line Display
Display Position
1234
16
DDRAM Address 00 01 02 03
....
0F
For Shift Left
01 02 03 04
....
10
For Shift Right
4F 00 01 02
....
0E
Figure 9. 1-Line by 16-Character Display Example
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