hd66712u Renesas Electronics Corporation., hd66712u Datasheet - Page 47
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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)
- Current page: 47 of 88
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HD66712U
Read Data from CG, DD, or SEG RAM
This instruction reads 8-bit binary data DDDDDDDD from CG, DD, or SEGRAM. CG, DD or SEGRAM
is selected by the previous specification of the address set instruction. If no address is specified, the first
data read will be invalid. When executing serial read instructions, the next address is normally read from
the next address. An address set instruction need not be executed just before this read instruction when
shifting the cursor by a cursor shift instruction (when reading from DDRAM). A cursor shift instruction is
the same as a set DDRAM address instruction.
After a read, the entry mode automatically increases or decreases the address by 1. However, a display
shift is not executed regardless of the entry mode.
Note: The address counter (AC) is automatically incremented or decremented after write instructions to
Table 11
HDS5 HDS4 HDS3 HDS2 HDS1 HDS0 Description
0
0
0
0
1
1
410
0
0
0
0
0
1
CG, DD or SEGRAM. The RAM data selected by the AC cannot be read out at this time even if
read instructions are executed. Therefore, to read data correctly, execute either an address set
instruction or a cursor shift instruction (only with DDRAM), or alternatively, execute a
preliminary read instruction to ensure the address is correctly set up before accessing the data.
HS5 to HS0 Settings
0
0
0
0
1
*
0
0
0
0
1
*
0
0
1
1
.
.
.
1
*
0
1
0
1
1
*
No shift
Shift the display position to the left by one dot.
Shift the display position to the left by two dots.
Shift the display position to the left by three dots.
Shift the display position to the left by forty-seven dots.
Shift the display position to the left by forty-eight dots.
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