REV. M

Page 15

September 1998

AS3502

Bit No

Symbol

Name and Description

D7

TRINJ

Tone Ringer Inject. When set to High the tone generator is connected to the toneringer

output. When set to Low the TRO+ and TRO- outputs are forced to high impedance

state.

D6

RXINJ

Receive Inject. When set to High the tone generator is connected to the AS3502

receive section.

D5

TXINJ

Transmit Inject. When set to High the tone generator is connected to the AS3502

transmit section.

D4

CS

Cadence Slow Bit. When set to High the cadence step size resolution is 4 ms. When

set to Low the cadence step size resolution is 1 ms.

D3

BURST

MODE

When set to High tone burst mode operation is selected.

D2

SHAPE

When set to High square wave mode is selected. When set to Low sine wave mode is

selected

D1

TONE

MODE

Tone Mode Bit. When set to High dual tone mode is selected. When set to Low single

tone mode is selected.

D0

START

Start Melody. When set to High the tone generation is enabled. This bit acts as single

byte on/off sequence.

8) SEQUENCE CONTROL REGISTER 1

This register contains the frequency codes for the first three steps of the six tone cadence.

SC1

D7

D6

D5

D4

D3

D2

D1

D0

Name

0

0

S31

S30

S21

S20

S11

S10

Default

0

0

x

x

x

x

x

x

Bit No

Symbol

Name and Description

D7, D6

-

Not used; will be low during read

D5, D4

S31, S30

Cadence Step 3:

00:

No Tone

01:

Frequency/Volume Register 1 is selected

10:

Frequency/Volume Register 2 is selected

11:

Frequency/Volume Register 3 is selected

S21, S20

Cadence Step 2

00:

No Tone

01:

Frequency/Volume Register 1 is selected

10:

Frequency/Volume Register 2 is selected

11:

Frequency/Volume Register 3 is selected

D1, D0

S11, S10

Cadence Step1

00:

No Tone

01:

Frequency/Volume Register 1 is selected

10:

Frequency/Volume Register 2 is selected

11:

Frequency/Volume Register 3 is selected