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YMF795
■Explanation of Registers
The YMF795 has three types of control registers: musical score data, timbre data, and other control data.
□Musical score data register
$00h Musical score data
The musical score data are written into the 32-word FIFO. There are two types of musical score data: note
data and rest data.
Default: 0000h
Note data
Index
B15
b14
$00h
BL1
BL0
BL1 – BL0 : Octave block setting
Three octave blocks are available for sound range setting. The setting range is 1 to 3. Do not set "0."
In addition, the sound generation range is affected by the coefficient called "Multiple (multiplying factor for sound
generation frequency)."
By combining the octave block and Multiple settings, sounds can be generated in the range as listed in the table blow.
Since the setting range of "Multiple" coefficient is 0 to 7, actually, sounds wider than those given in the table below can
be generated.
BL[1:0] = 01b
BL[1:0] = 10b
BL[1:0] = 11b
b13
b12
b11
b10
NT3 NT2
NT1
NT0
Multiple = 1 (x1)
C#3 (139Hz)
D3
(147Hz)
D#3 (156Hz)
E3
(165Hz)
F3
(175Hz)
F#3 (185Hz)
G3
(196Hz)
G#3 (208Hz)
A3
(220Hz)
A#3 (233Hz)
B3
(247Hz)
C4
(262Hz)
C#4 (277Hz)
D4
(294Hz)
D#4 (311Hz)
E4
(330Hz)
F4
(349Hz)
F#4 (370Hz)
G4
(392Hz)
G#4 (415Hz)
A4
(440Hz)
A#4 (466Hz)
B4
(494Hz)
C5
(523Hz)
C#5 (554Hz)
D5
(587Hz)
D#5 (622Hz)
E5
(659Hz)
F5
(698Hz)
F#5 (740Hz)
G5
(784Hz)
G#5 (831Hz)
A5
(880Hz)
A#5 (932Hz)
B5
(988Hz)
C6
(1046Hz)
b9
b8
b7
b6
CH1
CH0
VIB
TI3
Multiple = 2 (x2)
C#4 (277Hz)
D4
(294Hz)
D#4 (311Hz)
E4
(330Hz)
F4
(349Hz)
F#4 (370Hz)
G4
(392Hz)
G#4 (415Hz)
A4
(440Hz)
A#4 (466Hz)
B4
(494Hz)
C5
(523Hz)
C#5 (554Hz)
D5
(587Hz)
D#5 (622Hz)
E5
(659Hz)
F5
(698Hz)
F#5 (740Hz)
G5
(784Hz)
G#5 (831Hz)
A5
(880Hz)
A#5 (932Hz)
B5
(988Hz)
C6
(1046Hz)
C#6 (1109Hz)
D6
(1175Hz)
D#6 (1245Hz)
E6
(1319Hz)
F6
(1397Hz)
F#6 (1480Hz)
G6
(1568Hz)
G#6 (1661Hz)
A6
(1760Hz)
A#6 (1865Hz)
B6
(1976Hz)
C7
(2093Hz)
-9-
b5
b4
b3
b2
TI2
TI1
TI0
TK2
Multiple = 4 (x4)
C#5 (554Hz)
D5
(587Hz)
D#5 (622Hz)
E5
(659Hz)
F5
(698Hz)
F#5 (740Hz)
G5
(784Hz)
G#5 (831Hz)
A5
(880Hz)
A#5 (932Hz)
B5
(988Hz)
C6
(1046Hz)
C#6 (1109Hz)
D6
(1175Hz)
D#6 (1245Hz)
E6
(1319Hz)
F6
(1397Hz)
F#6 (1480Hz)
G6
(1568Hz)
G#6 (1661Hz)
A6
(1760Hz)
A#6 (1865Hz)
B6
(1976Hz)
C7
(2093Hz)
C#7 (2217Hz)
D7
(2349Hz)
D#7 (2489Hz)
E7
(2637Hz)
F7
(2794Hz)
F#7 (2960Hz)
G7
(3136Hz)
G#7 (3322Hz)
A7
(3520Hz)
A#7 (3729Hz)
B7
(3951Hz)
C8
(4186Hz)
b1
b0
TK1
TK0
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