GMS81C5108
:
CLRG
LDX
#<DISPRAM
{X}
;Address included the data
;to be displayed.
GOLCD:
LDA
TAY
LDA
LDM
SETG
LDX
STA
XCN
STA
CLRG
:
Write into the
LCD Memory
!FONT+Y
RPR,#1
;LOAD FONT DATA
;Set RPR = 1 to access LCD
;Set Page 1
#0
{X}+
;LOWER 4 BITS OF ACC. seg0
{X}
;UPPER 4 BITS OF ACC. seg1
;Set Page = 0
FONT
DB
DB
DB
DB
DB
DB
DB
DB
DB
DB
1101_0111B
0000_0110B
1110_0011B
1010_0111B
0011_0110B
1011_0101B
1111_0101B
0000_0111B
1111_0111B
0011_0111B
;
;
;
;
;
;
;
;
;
;
“0”
“1”
“2”
“3”
“4”
“5”
“6”
“7”
“8”
“9”
Font data
LCD Waveform
The LCD duty can be selected by LCR register. The kinds
of LCD waveforms are four totally. Among them, static
and 1/4 duty waveforms are shown Figure 19-8.
VCL2
VCL1
VCL0
COM0
1/4 Duty, 1/3 Bias Drive
GND
VCL2
VCL1
VCL0
GND
COM1
VCL2
SEG0
VCL1
VCL0
GND
COM2
SEG1
COM0
VCL2
VCL1
VCL0
GND
COM3
COM1
COM2
VCL2
VCL1
VCL0
SEG0
COM3
SEG0
SEG1
GND
VCL2
VCL1
VCL0
GND
SEG1
VCL2
VCL1
VCL0
0
SEG0 - COM0
-VCL0
-VCL1
-VCL2
VCL2
VCL1
VCL0
0
-VCL0
-VCL1
-VCL2
SEG1 - COM0
Figure 19-8 Example of LCD drive output
JUNE 2001 Ver 1.0
75
HYNIX [ HYNIX SEMICONDUCTOR ]
