Epson S1C63558 User Manual
Page 142
132
EPSON
S1C63558 TECHNICAL MANUAL
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
SINR
0
0
1
1
Control register
SINC
0
1
0
1
Tone output
DC level: 1/2 (V
DD
–V
SS
)
COL frequency
ROW frequency
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")
D3
0
0
0
0
0
0
0
0
D2
0
0
0
0
1
1
1
1
D1
0
0
1
1
0
0
1
1
D0
0
1
0
1
0
1
0
1
TCD code
COL frequency (Hz)
COL4:
1645.01
COL1: 1215.88
COL2: 1331.68
COL3: 1471.85
COL1: 1215.88
COL2: 1331.68
COL3: 1471.85
COL1: 1215.88
D3
1
1
1
1
1
1
1
1
D2
0
0
0
0
1
1
1
1
D1
0
0
1
1
0
0
1
1
D0
0
1
0
1
0
1
0
1
TCD code
COL frequency (Hz)
COL2: 1331.68
COL3: 1471.85
COL2: 1331.68
COL3: 1471.85
COL1: 1215.88
COL4: 1645.01
COL4: 1645.01
COL4: 1645.01
Table 4.14.10.6(b) Single-tone ROW frequencies (SINR = "1", SINC = "0")
D3
0
0
0
0
0
0
0
0
D2
0
0
0
0
1
1
1
1
D1
0
0
1
1
0
0
1
1
D0
0
1
0
1
0
1
0
1
TCD code
ROW frequency
(Hz)
ROW1: 701.32
ROW1: 701.32
ROW1: 701.32
ROW1: 701.32
ROW2: 771.45
ROW2: 771.45
ROW2: 771.45
ROW3: 857.17
D3
1
1
1
1
1
1
1
1
D2
0
0
0
0
1
1
1
1
D1
0
0
1
1
0
0
1
1
D0
0
1
0
1
0
1
0
1
TCD code
ROW frequency
(Hz)
ROW3: 857.17
ROW3: 857.17
ROW4: 935.10
ROW4: 935.10
ROW4: 935.10
ROW2: 771.45
ROW4: 935.10
ROW3: 857.17