HD66710 Datasheet, PDF (13/73 Pages) Hitachi Semiconductor – (Dot Matrix Liquid Crystal Display Controller/Driver)

HD66710
Display Data RAM (DDRAM)
Display data RAM (DDRAM) stores display data represented in 8-bit character codes. Its capacity is 80 ×
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 1 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 (N = 0) (Figure 2)
 When there are fewer than 80 display characters, the display begins at the head position. For
example, if using only the HD66710, 16 characters are displayed. See Figure 3.
When the display shift operation is performed, the DDRAM address shifts. See Figure 3.
High order
bits
Low order
bits
AC
(hexadecimal) ^{AC6 AC5 AC4 AC3 AC2 AC1 AC0}
Example: DDRAM address 4E
100 11 10
Figure 1 DDRAM Address
Display position
(digit)
12 3
DDRAM
address
00 01 02
(hexadecimal)
45
03 04 ^{. . . . . . . . . . . . . . . . . .}
79 80
4E 4F
Figure 2 1-Line Display
COM1 to 8
12345678
00 01 02 03 04 05 06 07
9 10 11 12 13 14 15 16
08 09 0A 0B 0C 0D 0E 0F
COM1 to 8
12345678
01 02 03 04 05 06 07 08
9 10 11 12 13 14 15 16
09 0A 0B 0C 0D 0E 0F 10
Display position
COM9 to 16
DRAM address
COM9 to 16 (Left shift display)
COM1 to 8
4F 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E
COM9 to 16 (Right shift display)
Figure 3 1-line by 16-Character Display Example
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