PSB4860HV4.1 Lantiq, PSB4860HV4.1 Datasheet - Page 48

• Manufacturer Part Number: PSB4860HV4.1
• Manufacturer: Lantiq

Specifications of PSB4860HV4.1

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Data Sheet
2.1.5
The contains an DTMF detector that recognizes the sixteen standard DTMF tones.
Figure 24 shows a block diagram of the DTMF detector. The results of the detector are
available in the status and a dedicated result register. These registers can be read by
the external controller via the serial control interface (SCI).
Figure 24 DTMF Detector - Block Diagram
Table 13 to 15 show the associated registers.
Table 13
Register # of Bits
DDCTL
DDCTL
As soon as a valid DTMF tone is recognized, the status word and the DTMF tone code
are updated (table 14).
Table 14
Register # of Bits
STATUS 1
DDCTL
DTV is set when a DTMF tone is currently recognized and cleared when no DTMF tone
is recognized or the detector is disabled. The code for the DTMF tone is provided in
register DDCTL. DTC is valid when DTV is set and until the next incoming DTMF tone.
The registers DDTW and DDLEV contain the parameters for detection (table 15).
Table 15
Register
DDTW
DDLEV
1
5
5
DTMF Detector
DTMF Detector Control Register
DTMF Detector Results
DTMF Detector Parameters
# of Bits
15
6
Name
EN
I1
Name
DTV
DTC
Name
TWIST
MIN
I
1
Comment
DTMF detector enable
Input signal selection
Comment
DTMF code valid
DTMF tone code
Detector
DTMF
Comment
Twist for DTMF recognition
Minimum signal level to detect DTMF tones
48
SCI
PSB 4860
2000-01-14