DTMFDECODER-RD Silicon Laboratories Inc, DTMFDECODER-RD Datasheet - Page 53
DTMFDECODER-RD
Manufacturer Part Number
DTMFDECODER-RD
Description
KIT REF DESIGN DTMF DECODER
Manufacturer
Silicon Laboratories Inc
Specifications of DTMFDECODER-RD
Mfg Application Notes
DTMF Decoder Ref Design AppNote
Main Purpose
Telecom, DTMF Decoder
Embedded
No
Utilized Ic / Part
C8051F300
Primary Attributes
8kHz Sampling Rate ADC
Secondary Attributes
16 Goertzel Filters
Processor To Be Evaluated
C8051F300
Interface Type
RS-232
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
Other names
336-1283
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Comparator0 interrupts can be generated on both rising-edge and falling-edge output transitions. (For
Interrupt enable and priority control, see
is set to logic 1 upon a Comparator0 falling-edge interrupt, and the CP0RIF flag is set to logic 1 upon the
Comparator0 rising-edge interrupt. Once set, these bits remain set until cleared by software. The output
state of Comparator0 can be obtained at any time by reading the CP0OUT bit. Comparator0 is enabled by
setting the CP0EN bit to logic 1, and is disabled by clearing this bit to logic 0.
Bit7:
Bit6:
Bit5:
Bit4:
Bits3–2: CP0HYP1–0: Comparator0 Positive Hysteresis Control Bits.
Bits1–0: CP0HYN1–0: Comparator0 Negative Hysteresis Control Bits.
CP0EN
R/W
Bit7
CP0EN: Comparator0 Enable Bit.
0: Comparator0 Disabled.
1: Comparator0 Enabled.
CP0OUT: Comparator0 Output State Flag.
0: Voltage on CP0+ < CP0–.
1: Voltage on CP0+ > CP0–.
CP0RIF: Comparator0 Rising-Edge Interrupt Flag.
0: No Comparator0 Rising Edge Interrupt has occurred since this flag was last cleared.
1: Comparator0 Rising Edge Interrupt has occurred.
CP0FIF: Comparator0 Falling-Edge Interrupt Flag.
0: No Comparator0 Falling-Edge Interrupt has occurred since this flag was last cleared.
1: Comparator0 Falling-Edge Interrupt has occurred.
00: Positive Hysteresis Disabled.
01: Positive Hysteresis = 5 mV.
10: Positive Hysteresis = 10 mV.
11: Positive Hysteresis = 20 mV.
00: Negative Hysteresis Disabled.
01: Negative Hysteresis = 5 mV.
10: Negative Hysteresis = 10 mV.
11: Negative Hysteresis = 20 mV.
CP0OUT
Bit6
R
SFR Definition 7.1.
CP0RIF
R/W
Bit5
CP0FIF CP0HYP1 CP0HYP0 CP0HYN1 CP0HYN0 00000000
R/W
Bit4
Section “8.3. Interrupt Handler” on page
CPT0CN: Comparator0 Control
Rev. 2.9
R/W
Bit3
R/W
Bit2
C8051F300/1/2/3/4/5
R/W
Bit1
(bit addressable)
72). The CP0FIF flag
R/W
Bit0
SFR Address:
Reset Value
0xF8
53
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