hd66108 Renesas Electronics Corporation., hd66108 Datasheet - Page 45
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hd66108
Manufacturer Part Number
hd66108
Description
Ram-provided 165-channel Lcd Driver For Liquid Crystal Dot Matrix Graphics - Hitachi Semiconductor
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.HD66108.pdf
(60 pages)
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HD66108
2. Display Memory (DRAM) (Accessed with RS = 1, Register Number = (B’000)
Although display memory (Figure 28) is not a register, it can be handled as one. 8- or 6-bit data can be
selected by the control register WLS bit according to the character font in use. If 6-bit data is selected,
D7 and D6 bits are invalid.
3. X Address Register (XAR) (Accessed with RS = 1, Register Number = (B’001)
This register (Figure 29) contains 3 invalid bits (D7 to D5) and 5 valid bits (D4 to D0). It sets X addresses
and confirms X addresses after writing or reading to or from the display memory.
4. Y Address Register (YAR) (Accessed with RS = 1, Register Number = (B’010)
This register (Figure 30) contains 1 invalid bit (D7) and 7 valid bits (D6 to D0). It sets Y addresses and
confirms Y addresses after writing or reading to or from the display memory.
998
XAD: 0 to 20 (H'00 to H'14) when display data is 8 bits long and
Reading bits marked with * return 0s and writing them is invalid.
YAD: 0 to 64 (H'00 to H'40)
D7
D7
D7
*
—
0 to 27 (H'00 to H'1B) when display data is 6 bits long. A
maximum of H'1F is programmable.
Figure 29 X Address Register
Figure 30 Y Address Register
D6
—
D6
Figure 28 Display Memory
D6
*
D5
D5
D5
D4
D4
8-bit data
D4
D3
YAD
D3
6-bit data
D3
XAD
D2
D2
D2
D1
D1
D1
D0
D0
D0
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