hd66712u Renesas Electronics Corporation., hd66712u Datasheet - Page 15
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hd66712u
Manufacturer Part Number
hd66712u
Description
Dot-matrix Liquid Crystal Display Controller/driver - Hitachi Semiconductor
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.HD66712U.pdf
(88 pages)
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HD66712U
Table 2
RS
0
0
1
1
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.
The DDRAM address (A
Figure 1.
The relationship between DDRAM addresses and positions on the liquid crystal display is described and
shown on the following pages for a variety of cases.
378
Resistor Selection
R/
0
1
0
1
: :
AC
DD
) is set in the address counter (AC) as a hexadecimal number, as shown in
Operation
IR write as an internal operation (display clear, etc.)
Read busy flag (DB7) and address counter (DB0 to DB6)
DR write as an internal operation (DR to DDRAM, CGRAM, or SEGRAM)
DR read as an internal operation (DDRAM, CGRAM, or SEGRAM to DR)
MSB
AC6 AC5 AC4 AC3 AC2 AC1 AC0
Figure 1 DDRAM Address
LSB
Example: DDRAM address 4E
1
0
0
1
1
1
0
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