hd66420 Renesas Electronics Corporation., hd66420 Datasheet - Page 18
hd66420
Manufacturer Part Number
hd66420
Description
Ram-provided 160 Channel 4-level Grey Scale Driver For Dot Matrix Graphics Lcd
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.HD66420.pdf
(52 pages)
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HD66420
Word Length
The HD66420 can handle either 8- or 6-bits as a word. In the display memory, one X address is assigned to
each word of 8- or 6-bits long in X direction.
When the 6-bits mode is selected, only data on DB5 to DB0 are used and data on DB7 and DB6 are
discarded. This word length is only applied to data to internal RAM. The word length of internal register is
always 8-bits
H’00
H’01
H’4E
H’4F
18
SEG1
MSB
8 bits
H’0
(a) Address assignment when one
word is 8 bits long
H’1
LCD drive signal output
X addresses
Figure 9 Display RAM Addresses
H’27
SEG160
H’4E
H’4F
H’00
H’01
SEG1
6 bits
H’0
(b) Address assignment when one
word is 6 bits long
MSB
H’1
LCD drive signal output
X addresses
H’34
SEG160
H’35
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