M34116 INSTRUCTION SET (continued)

INSTRUCTION 5: M34116 TONE GENERATION

Up to 7 Tone and 1 Melody channels may be active simultaneously. The instruction format for Tone and

Melody is the same. For each Tone channel from 1 up to 4 couples of Step/Time may be specified while

for the Melody channel from 1 up to 32 couples of Step/Time may be specified.

Note:

The Melody channel can be channel 0 or 8 or 16 or 24 etc. according to the following formula:

The Tone channel assignment follows the same rule:

. . . . . ... ... . . . . . . . . . . . . . . . . . . ... ... ... ... .. . .

This means that, selecting the tone 1 on the channel 9 (or and other one of its series), the channels 1,

17, 25.... can not be used for tones (or melody). The same is occuring for the tones 2...7 or the melody.

Control Signal

Data Bus

CS

RD

C/D

WR

D7

D6

D5

D4

D3

D2

D1

D0

0

1

0

0

AO4

AO3

AO2

AO1

AO0

0

1

0

0

C4

C3

C2

C1

C0

01

10

1

100

0

1

0

0

S17

S16

S15

S14

S13

S12

S11

S10

0

1

0

0

T17

T16

T15

T14

T13

T12

T11

T10

0

1

0

0

S27

S26

S25

S24

S23

S22

S21

S20

0

1

0

0

T27

T26

T25

T24

T23

T22

T21

T20

::

:

::::::

:::

optional end code:

01

0011

111

111

opcode:

01

10

1

100

y AO4–AO0: Output attenuation or gain (

±15dB) AO4 = 1 gain, AO4 = 0 attenuation,

AO3–AO0 value in dB (0–15)

0dB attenuation or gain correspond to -6dBm0 level.

y C5–C0: Channel number (0–63)

y Sn7–Sn0: Frequency Step for the n–th note in the tone sequence (n = 1–4 for tone n = 1–32 for

melody). Step is a compressed coding of the frequency value. Given a frequency value f the value of

S7–S0 can be calculated as follow:

32

125

)

2) apply the following table to get S7–S0 value from SL value (see also Appendix 1A and 1B).

S7

S6

Linear Step SL value (10 bit)

(SL decimal)

STEP (Hz)

0

0

0

0

0

0

S5

S4

S3

S2

S1

S0

(1

→64) (*)

3.9

0

0

0

0

0

1

S5

S4

S3

S2

S1

S0

(65–>127) (**)

3.9

0

1

0

0

1

S5

S4

S3

S2

S1

S0

0

(128–>254)

7.8

1

0

0

1

S5

S4

S3

S2

S1

S0

0

0

(256–>508)

15.6

1

1

1

S5

S4

S3

S2

S1

S0

0

0

0

(512–>1008)

31.2

(*) For tone 7 only; (**) For melody and tone 1-6

Note: to obtain a Pause (Silence) –> S7–S0 must be all 0’s

y End code: if Less than 4 couples of Step/Time for tone or less than 32 for melody are to be specified

then after the last couple of Step/Time a Step of all 1’s (optional end code) must be sent before the

opcode. Otherwise it must be skipped.

y Tn7–Tn0: Specify the duration of the n’th note or pause. The time increment is 32ms. To get T7–T0

value, divide the wanted duration in ms by 32 and round to integer.

Note: The minimum time between rising edges of successive WR for tone generation instruction is 4ck

periods (6ck periods if EC = 1).

M34116

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