NJU6645 Datasheet, PDF (28/112 Pages) New Japan Radio – 16-CHARACTER 6-LINE LCD DRIVER with JAPANESE KANJI ROM

NJU6645 ^Preliminary
(ii) Full-size font character
The full-size data becomes the data of 1-character by the input data of 2-byte, and it is stored at two RAM
address. The attribute data is allocated in upper 2-bit in the 1st input byte. When the full-size font, “0” is
stored in the MSB of RAM data as Full-size/half-size discrimination bit. And, “0” or “1” is stored in the 2nd
bit of RAM as 1st byte/2nd byte discrimination data. (1st bit : “0”, 2nd bit : “1”)
The character code is 14-bit stuffed into the lower bit excluding 1-bit (code : ”0”) and 9-bit (code : ”0”) of JIS
codes (16-bit).
The relation between each bit allocation of JIS code and input data and the RAM is as follows.
0
JIS code upper 7bit
0
JIS code
JIS code lower 7bit
Input data
In case of 1st byte
→ D9=”0”
Except for ALL”0”
→ D10=”0”
DDRAM
DDRAM address
1^st byte
2^nd byte
Full-size character code 14bit
Character code upper 6bit
n
In case of 2nd byte
→ D9=”1”
Character code lower 8bit
n+1
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Ver.2009-05-20