NJU6624AFG1 데이터 시트보기 (PDF) - Japan Radio Corporation
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NJU6624AFG1
Japan Radio Corporation
NJU6624AFG1 Datasheet PDF : 35 Pages
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NJU6624A/B
(1-5)Character Generator RAM ( CG RAM )
The character generator RAM ( CG RAM ) can store any kind of character pattern in 5 x 7 dots written by the user
program to display user's original character pattern. The CG RAM can store 32 kind of character in 5 x 7 dots
mode.
To display user's original character pattern stored in the CG RAM, the address data (00)H-(1F)H should be written
to the DD RAM as shown in Table 2.
Table 3. shows the correspondence among the character pattern, CG RAM address and Data.
Table 3. Correspondence of CG RAM address, DD RAM character code
and CG RAM character pattern( 5 x 7 dots )
Character Code
(DD RAM Data)
CG RAM Address
Character
Pattern
(CG RAM
Data)
76543210 76543210
Upperbit
Lower bit Upperbit
Lower bit
00000000
00000
000
001
010
011
100
101
110
111
00000001
00001
000
001
010
011
100
101
110
111
000
001
43210
Upper
Lower
bit
bi t
11 110
10 001
10 001
11 110
10 100
10 010
10 001
* * ** *
10 001
010 10
111 11
001 00
111 11
001 00
001 00
*** **
Character Pattern
Example(1)
<= Cursor Position
Character Pattern
Example(2)
<= Cursor Position
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00011111 11111
*=Don't care
100
101
110
111
Notes :
1. Character code bit 0 to 4 correspond to the CG RAM address bit 3 to 7(5bits:32 patterns).
2. CG RAM address 0 to 2 designate character pattern line position. The 8th line is Don't care line.
In case of input CG RAM data continuously, invalid address are Cursor position automatically.
3. Character pattern row position correspond to the CG RAM data bits 0 to 4 are shown above.
4. CG RAM character patterns are selected when character code of DD RAM bits 5 to 7 are all "0"
and these are addressed by character code bits 0 and 1.
5. "1" for CG RAM data corresponds to display On and "0" to display Off.
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