16 SOUND GENERATOR (SNDA)
S1C17M20/M21/M22/M23/M24/M25
Seiko Epson Corporation
16-5
TECHNICAL MANUAL (Rev. 1.0)
Table 16.4.2.1 Buzzer Frequency Settings (when f
CLK_SNDA
= 32,768 Hz)
SNDDAT.
SFRQ[7:0] bits
Frequency
[Hz]
SNDDAT.
SFRQ[7:0] bits
Frequency
[Hz]
SNDDAT.
SFRQ[7:0] bits
Frequency
[Hz]
SNDDAT.
SFRQ[7:0] bits
Frequency
[Hz]
0x3f
512.0
0x2f
682.7
0x1f
1,024.0
0x0f
2,048.0
0x3e
520.1
0x2e
697.2
0x1e
1,057.0
0x0e
2,184.5
0x3d
528.5
0x2d
712.3
0x1d
1,092.3
0x0d
2,340.6
0x3c
537.2
0x2c
728.2
0x1c
1,129.9
0x0c
2,520.6
0x3b
546.1
0x2b
744.7
0x1b
1,170.3
0x0b
2,730.7
0x3a
555.4
0x2a
762.0
0x1a
1,213.6
0x0a
2,978.9
0x39
565.0
0x29
780.2
0x19
1,260.3
0x09
3,276.8
0x38
574.9
0x28
799.2
0x18
1,310.7
0x08
3,640.9
0x37
585.1
0x27
819.2
0x17
1,365.3
0x07
4,096.0
0x36
595.8
0x26
840.2
0x16
1,424.7
0x06
4,681.1
0x35
606.8
0x25
862.3
0x15
1,489.5
0x05
5,461.3
0x34
618.3
0x24
885.6
0x14
1,560.4
0x04
6,553.6
0x33
630.2
0x23
910.2
0x13
1,638.4
0x03
8,192.0
0x32
642.5
0x22
936.2
0x12
1,724.6
0x02
10,922.7
0x31
655.4
0x21
963.8
0x11
1,820.4
0x01
16,384.0
0x30
668.7
0x20
993.0
0x10
1,927.5
0x00
Cannot be set
Table 16.4.2.2 Buzzer Duty Ratio Setting Examples (when f
CLK_SNDA
= 32,768 Hz)
SNDDAT.
SLEN[5:0] bits
Duty ratio by buzzer frequency
16,384 Hz
8,192 Hz
4,096 Hz
2,048 Hz
1,024 Hz
512 Hz
0x3f
–
–
–
–
–
–
0x3e
–
–
–
–
–
98.4
0x3d
–
–
–
–
–
96.9
0x3c
–
–
–
–
–
95.3
0x3b
–
–
–
–
–
93.8
0x3a
–
–
–
–
–
92.2
0x39
–
–
–
–
–
90.6
0x38
–
–
–
–
–
89.1
0x37
–
–
–
–
–
87.5
0x36
–
–
–
–
–
85.9
0x35
–
–
–
–
–
84.4
0x34
–
–
–
–
–
82.8
0x33
–
–
–
–
–
81.3
0x32
–
–
–
–
–
79.7
0x31
–
–
–
–
–
78.1
0x30
–
–
–
–
–
76.6
0x2f
–
–
–
–
–
75.0
0x2e
–
–
–
–
–
73.4
0x2d
–
–
–
–
–
71.9
0x2c
–
–
–
–
–
70.3
0x2b
–
–
–
–
–
68.8
0x2a
–
–
–
–
–
67.2
0x29
–
–
–
–
–
65.6
0x28
–
–
–
–
–
64.1
0x27
–
–
–
–
–
62.5
0x26
–
–
–
–
–
60.9
0x25
–
–
–
–
–
59.4
0x24
–
–
–
–
–
57.8
0x23
–
–
–
–
–
56.3
0x22
–
–
–
–
–
54.7
0x21
–
–
–
–
–
53.1
0x20
–
–
–
–
–
51.6
0x1f
–
–
–
–
–
50.0
0x1e
–
–
–
–
96.9
48.4
0x1d
–
–
–
–
93.8
46.9
0x1c
–
–
–
–
90.6
45.3
0x1b
–
–
–
–
87.5
43.8
0x1a
–
–
–
–
84.4
42.2
0x19
–
–
–
–
81.3
40.6
0x18
–
–
–
–
78.1
39.1
0x17
–
–
–
–
75.0
37.5
0x16
–
–
–
–
71.9
35.9
0x15
–
–
–
–
68.8
34.4
0x14
–
–
–
–
65.6
32.8
0x13
–
–
–
–
62.5
31.3
0x12
–
–
–
–
59.4
29.7