CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Telephone Function)

SINR: DTMF row frequencies output enable (FF16H•D1)

Enables or disables the DTMF row frequency output.

When "1" is written: Enabled

When "0" is written: Disabled

Reading: Valid

This register is used to set the tone output mode with the SINC register. Write "1" to this register when performing dual-tone output or single-tone ROW frequency output.

At initial reset, this register is set to "1".

SINC: DTMF column frequencies output enable (FF16H•D0)

Enables or disables the DTMF column frequency output.

When "1" is written: Enabled

When "0" is written: Disabled

Reading: Valid

This register is used to set the tone output mode with the SINR register. Write "1" to this register when performing dual-tone output or single-tone COL frequency output.

At initial reset, this register is set to "1".

Table 4.14.10.5 lists the tone output selection using the SINR and SINC registers.

Table 4.14.10.5 Selection of tone output

Control register

Tone output

SINR

SINC

 

0

0

DC level: 1/2 (VDD–VSS)

0

1

COL frequency

1

0

ROW frequency

1

1

Dual tone output

Tables 4.14.10.6(a) and (b) list the frequencies set by the TCD register (FF17H) when single tone output is selected.

Table 4.14.10.6(a) Single-tone COL frequencies (SINR = "0", SINC = "1")

 

TCD code

 

COL frequency (Hz)

D3

D2

D1

D0

0

 

0

0

 

0

COL4: 1645.01

0

 

0

0

 

1

COL1: 1215.88

0

 

0

1

 

0

COL2: 1331.68

0

 

0

1

 

1

COL3: 1471.85

0

 

1

0

 

0

COL1: 1215.88

0

 

1

0

 

1

COL2: 1331.68

0

 

1

1

 

0

COL3: 1471.85

0

 

1

1

 

1

COL1: 1215.88

 

TCD code

 

COL frequency (Hz)

D3

D2

D1

D0

1

 

0

0

 

0

COL2: 1331.68

1

 

0

0

 

1

COL3: 1471.85

1

 

0

1

 

0

COL2: 1331.68

1

 

0

1

 

1

COL3: 1471.85

1

 

1

0

 

0

COL1: 1215.88

1

 

1

0

 

1

COL4: 1645.01

1

 

1

1

 

0

COL4: 1645.01

1

 

1

1

 

1

COL4: 1645.01

Table 4.14.10.6(b) Single-tone ROW frequencies (SINR = "1", SINC = "0")

 

TCD code

 

ROW frequency

D3

D2

D1

D0

(Hz)

0

 

0

0

 

0

ROW1: 701.32

0

 

0

0

 

1

ROW1: 701.32

0

 

0

1

 

0

ROW1: 701.32

0

 

0

1

 

1

ROW1: 701.32

0

 

1

0

 

0

ROW2: 771.45

0

 

1

0

 

1

ROW2: 771.45

0

 

1

1

 

0

ROW2: 771.45

0

 

1

1

 

1

ROW3: 857.17

 

TCD code

 

ROW frequency

D3

D2

D1

D0

(Hz)

1

 

0

0

 

0

ROW3: 857.17

1

 

0

0

 

1

ROW3: 857.17

1

 

0

1

 

0

ROW4: 935.10

1

 

0

1

 

1

ROW4: 935.10

1

 

1

0

 

0

ROW4: 935.10

1

 

1

0

 

1

ROW2: 771.45

1

 

1

1

 

0

ROW4: 935.10

1

 

1

1

 

1

ROW3: 857.17

132

EPSON

S1C63558 TECHNICAL MANUAL