EM78P568

8-bit OTP Micro-controller

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* This specification are subject to be changed without notice.

18

01/31/2004

V4.7

PAGE1 (Programmable D/A tone selection register)

7

6

5

4

3

2

1

0

DAT7

DAT6

DAT5

DAT4

DAT3

DAT2

DAT1

DAT0

R/W-1

R/W-1

R/W-1

R/W-1

R/W-1

R/W-1

R/W-1

R/W-1

Bit 0 ~ Bit 7 (DAT0 ~ DAT7) : D/A tone output frequency selection

The programmable D/A tone output frequency = 447829Hz / Mi / 32, where Mi = DAT7 ~ DAT0 = 1 ~ 255

When Mi = DAT7 ~ DAT0 = 0 or DAT/DAD(IOCA PAGE1 Bit 7) = 0, the D/A tone output generation

circuit will be disabled. It is specially used for CTCSS tone generation. Also refer to DAC for details.

DAC Tone

Gen.

fm =

447.829kHz

MUX

DA7~DA0

DAT/DAD

DAT7~DAT0

to DAC input

Fig.5 Programmable DAC tone generation

For example : CTCSS tone generation table

Channel

DAT7~DAT0 D/A tone

generation

CTCSS

tone

Mi

(decimal)

Act.

Freq.

-

00000000

Disable

-

-

-

1

11010001

Enable

67.0

209

66.960

2

11001010

69.3

202

69.280

3

11000011

71.9

195

71.767

4

10111100

74.4

188

74.440

5

10110110

77.0

182

76.894

6

10110000

79.7

176

79.515

7

10101010

82.5

170

82.322

8

10100100

85.4

164

85.333

9

10011110

88.5

158

88.574

10

10011001

91.5

153

91.468

11

10010100

94.8

148

94.558

12

10010000

97.4

144

97.185

13

10001100

100.0

140

99.962

14

10000111

103.5

135

103.664

15

10000011

107.2

131

106.829

16

01111110

110.9

126

111.069

17

01111010

114.8

122

114.710

18

01110110

118.8

118

118.599

19

01110010

123.0

114

122.760

20

01101110

127.3

110

127.224

21

01101010

131.8

106

132.025

22

01100111

136.5

103

135.870

23

01100011

141.3

99

141.360

24

01100000

146.2

96

145.778

25

01011100

151.4

92

152.116

26

01011001

156.7

89

157.243

27

01011000

159.8

88

159.030

28

01010110

162.2

86

162.729

29

01010011

167.9

83

168.610