Memory Organization (display RAM and control RAM)
Both memory addresses and data are 16-bit quantities.
The locations at addresses 000 (000 hexadecimal) to 175 (0AF hexadecimal) hold display memory (RAM) data.
The locations at addresses 176 (0B0 hexadecimal) to 191 (0BF hexadecimal) hold display control register data.
No. 5396-6/15
LC74751
Bit
DA
Notes
Address
F
E
D
C
B
A
9876543210
000
00000000
ATTR
C6
C5
C4
C3
C2
C1
C0
(000h)
ATTR
Character code
Display RAM
175
00000000
ATTR
C6
C5
C4
C3
C2
C1
C0
(0AFh)
176
00000
ADR
Display line ROM specification
(0B0h)
A
9876543210
First character in the first line
177
00000
ADR
Display line ROM specification
(0B1h)
A
9876543210
First character in the second line
178
00000
ADR
Display line ROM specification
(0B2h)
A
9876543210
First character in the third line
179
00000
ADR
Display line ROM specification
(0B3h)
A
9876543210
First character in the fourth line
180
00000
ADR
Display line ROM specification
(0B4h)
A
9876543210
First character in the fifth line
181
00000
ADR
Display line ROM specification
(0B5h)
A
9876543210
First character in the sixth line
182
00000
ADR
Display line ROM specification
(0B6h)
A
9876543210
First character in the seventh line
183
00000
ADR
Display line ROM specification
(0B7h)
A
9876543210
First character in the eighth line
184
00000
ADR
Display line ROM specification
(0B8h)
A
9876543210
First character in the ninth line
185
00000
ADR
Display line ROM specification
(0B9h)
A
9876543210
First character in the tenth line
186
00000
ADR
Display line ROM specification
(0BAh)
A
9876543210
First character in the eleventh line
187
00000
ADR
Display line ROM specification
(0BBh)
A
9876543210
First character in the twelfth line
188
0000
HSZ
HP5
HP4
HP3
HP2
HP1
HP0
Horizontal display position
(0BCh)
31
30
21
20
11
10
Horizontal character size
189
0000
VSZ
VP5
VP4
VP3
VP2
VP1
VP0
Vertical display position
(0BDh)
31
30
21
20
11
10
Vertical character size
190
0000
INT/
LC/
2fsc/
OSC
DSP
MUTE
SYS
SIG
PHASE PHASE PHASE
Video signal and other items
(0BEh)
NON
XTAL
4fsc
STP
ON
RST
MD1
MD0
2
1
0
191
0000
TST
VSN
0
BLK
RVS
BLINK BLINK BLINK
EXT/
CBOFF BCOL
Control register
(0BFh)
MOD
SEP
1
0
ON
2
1
0
INT