IEE 03858-21-0105, Reference Manual

Page: 11 / 24

Industrial Electronic Engineers, Inc.
SIZE
A
CODE IDENT NO.
05464
S03858–21–0105
Van Nuys, California Scale: NONE Rev B Sheet 11
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 Operation
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 R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
1 0 0 0 0 1 1 * * * *
2 0 0 0 0 1 1 * * * *
3 0 0 0 0 1 DL 1 0 * *
4 0 0 0 0 0 0 0 0 0 1
5 0 0 0 0 0 0 0 1 I/D S
6 0 0 0 0 0 0 1 D C B
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 02 03 04 05 06 07 08 09 0A 22 23 24 25 26 27
MPU1 40 41 42 43 44 45 46 47 48 49 4A 62 63 64 65 66 67
00* 01 02 03 04 05 06 07 08 09 0A 22 23 24 25 26 27
MPU2 40 41 42 43 44 45 46 47 48 49 4A 62 63 64 65 66 67
* = Cursor
Figure 6 Initial Conditions on Power Up
01 02 03 04 05 06 07 08 09 0A 0B 23 24 25 26 27 00*
MPU1 41 42 43 44 45 46 47 48 49 4A 4B 63 64 65 66 67 40
00* 01 02 03 04 05 06 07 08 09 0A 22 23 24 25 26 27
MPU2 40 41 42 43 44 45 46 47 48 49 4A 62 63 64 65 66 67
* = Cursor
Figure 7 Display Shift Left from Initial Conditions
27 00* 01 02 03 04 05 06 07 08 09 21 22 23 24 25 26