805-00012 Datasheet, PDF (7/11 Pages) List of Unclassifed Manufacturers – Parallax Serial LCD

Set Scale
The “set scale” commands (Dec 215 to 219) determines the octave each note will play in. This value
remains the same until another “set scale” command is received. The current octave can be set to a
value between 3 and 7, and each octave consists of 12 notes. The frequency for each note and scale
combination is shown in the table below.
Scale
3
4
5
6
7
A
220
440
880
1760
3520
A#
233
466
932
1865
3729
B
247
494
988
1976
3951
C
262
523
1047
2093
4186
C#
277
554
1109
2217
4435
D
294
587
1175
2349
4699
D#
311
622
1245
2489
4978
E
330
659
1319
2637
5274
F
349
698
1397
2794
5588
F#
370
740
1480
2960
5920
G
392
784
1568
3136
6272
G#
415
831
1661
3322
6645
Play Note
The “play note” commands (Dec 220 to 232) play a single note for the currently set time and in the
currently set octave.
Command Set
The tables on the following pages list all of the valid Serial LCD commands. Commands marked as N/A
are invalid and are ignored. The lines of the LCD display are numbered starting from 0, with line 0 being
the top line. The character positions on each line are numbered starting from 0, with position 0 being the
leftmost position on the line.
Dec
0
1
2
3
4
5
6
7
8
9
10
Dec
11
12
13
14 - 16
17
Hex
00
01
02
03
04
05
06
07
08
09
0A
Hex
0B
0C
0D
0E - 10
11
Action
Display custom character 0
Display custom character 1
Display custom character 2
Display custom character 3
Display custom character 4
Display custom character 5
Display custom character 6
Display custom character 7
Backspace / Left - The cursor is moved one position to the left. The
command doesn’t erase the character.
Right - The cursor is moved one position to the right. The
command doesn’t erase the character.
Line Feed - The cursor is moved down one line. For the two line
LCD model, if on line 0 it goes to line 1. If on line 1, it wraps
around to line 0. The horizontal position remains the same.
Action
N/A
Form Feed - The cursor is moved to position 0 on line 0 and the
entire display is cleared. Users must pause 5mS after this
command.
Carriage Return – For the two line LCD model, if on line 0 the cursor
is moved to position 0 on line 1. If on line 1, it wraps around to
position 0 on line 0.
N/A
Turn backlight on (only on models 27977, 27979)
Copyright © Parallax Inc.
Parallax Serial LCDs (#27976, 27977, 27979)
v3.1 3/11/2013 Page 7 of 11