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3.2
Power Up Instructions Sequence
Upon power up, the Daystar Nova module is set to a default mode of operation. Under some power up
circumstances, the default mode may be improperly set. Consequently, the following instructions should
always be executed in the host systems initialization routine.
Step
1
Function Set for 8 bits
2
Repeat, Function Set for 8 bits
3
Function Set
4
Clear Display
5
Entry Mode Set
6
Display On/Off Control
STEP
RS
1
0
2
0
3
0
4
0
5
0
6
0
Refer to instruction set for values of DL, I/D, S, D, C and B. (* Don't care)
3.3
Instructions Affecting the Relationship of Display Position, Cursor, and DD RAM Address
The DD RAM contains the 8 bit character codes of the 40 characters displayed on the Daystar Nova LCD. The
Cursor or Display Shift instruction and the Write to DD RAM and Entry Mode instructions affect the relationship
between DD RAM address and display position. Figures 6 to 10 illustrate the effects of these instructions.
00*
01
MPU1
40
41
00*
01
MPU2
40
41
* = Cursor
01
02
MPU1
41
42
00*
01
MPU2
40
41
* = Cursor
27
00*
Industrial Electronic Engineers, Inc.
Van Nuys, California
Operation
R/W
DB7
DB6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
02
03
04
05
06
42
43
44
45
46
02
03
04
05
06
42
43
44
45
46
Figure 6
03
04
05
06
07
43
44
45
46
47
02
03
04
05
06
42
43
44
45
46
Figure 7
Display Shift Left from Initial Conditions
01
02
03
04
05
DB5
DB4
1
1
1
1
1
DL
0
0
0
0
0
0
07
08
09
0A
47
48
49
4A
07
08
09
0A
47
48
49
4A
Initial Conditions on Power Up
08
09
0A
0B
48
49
4A
4B
07
08
09
0A
47
48
49
4A
06
07
08
09
SIZE
CODE IDENT NO.
A
05464
Scale: NONE
DB3
DB2
DB1
*
*
*
*
*
*
1
0
*
0
0
0
0
1
I/D
1
D
C
22
23
24
62
63
64
22
23
24
62
63
64
23
24
25
63
64
65
22
23
24
62
63
64
21
22
23
S03875–21–0114
Rev A
Sheet 11
DB0
*
*
*
1
S
B
25
26
27
65
66
67
25
26
27
65
66
67
26
27
00*
66
67
40
25
26
27
65
66
67
24
25
26
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