SM8521 Datasheet, PDF (44/56 Pages) Sharp Electrionic Components – 8-Bit Single-Chip Microcomputer

SM8521
Registers
SGC (Control register)
Bit 7
0
SONDOUT - - - DIROUT SG2OUT SG1OUT SG0OUT
Bits 7 : Sound output enable
Bits 6 to 4 : Set ‘0’.
Bit 3 : D/A direct output enable
Bit 2 : SG2 output enable
Bit 1 : SG1 output enable
Bit 0 : SG0 output enable
SG0L, SG1L (Output level control register ;
0, 1/32, 2/32…31/32)
Bit 7
0
- - - SGxL4 SGxL3 SGxL2 SGxL1 SGxL0
(x = 0, 1)
The value of output level control register decides
the digital attention rate.
SG0TL, SG1TL (Time constant register ; Low)
Bit 7
0
SGxTL7 SGxTL6 SGxTL5 SGxTL4 SGxTL3 SGxTL2 SGxTL1 SGxTL0
(x = 0, 1)
SG0TH, SG1TH (Time constant register ; High)
Bit 7
0
- - - - SGxTH3 SGxTH2 SGxTH1 SGxTH0
(x = 0, 1)
Bits 7 to 4 : Set ‘0’.
A period of one step is variable based on the value
of Time constant register (SG0TL, SG0TH, SG1TL
and SG1TH composed of 12 bits.)
SG0W0-15, SG1W0-15 (Waveform register 0-15)
Bit 7
0
SGxWy7 SGxWy6 SGxWy5 SGxWy4 SGxWy3 SGxWy2 SGxWy1 SGxWy0
(x = 0, 1)(y = 0 to 15)
Bits 7 to 4 : Waveform data Low order
Bits 3 to 0 : Waveform data High order
SG2L (Output level control register ; 0, 1/32,
2/32…31/32)
Bit 7
0
- - - SG2L4 SG2L3 SG2L2 SG2L1 SG2L0
Bits 7 to 5 : Set ‘0’.
The value of output level control register decides
the digital attenuation rate.
SG2TL (Time constant register ; Low)
Bit 7
0
SG2TL7 SG2TL6 SG2TL5 SG2TL4 SG2TL3 SG2TL2 SG2TL1 SG2TL0
SG2TH (Time constant register ; High)
Bit 7
0
- - - - SG2TH3 SG2TH2 SG2TH1 SG2TH0
Bits 7 to 4 : Set ‘0’.
A period of one step is variable based on the value
of Time constant register (SG2TL and SG2TH
composed of 12 bits).
SGDA (D/A direct output register ; write only)
Bit 7
0
SGDA7 SGDA6 SGDA5 SGDA4 SGDA3 SGDA2 SGDA1 SGDA0
The value of SGDA register directly transfers
digital mixer.
NOTES :
• Time constant register must be written by "MOVW"
instruction.
• Each time constant register must not be filled with all "0"
or only the Low significant bit is "1".
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