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參數(shù)資料
| 型號： | EM78P568 |
| 廠商： | ELAN Microelctronics Corp . |
| 英文描述： | 8-BIT OTP MICRO-CONTROLLER |
| 中文描述： | 8位檢察官微控制器 |
| 文件頁數(shù)： | 49/61頁 |
| 文件大?。?/td> | 568K |
| 代理商： | EM78P568 |
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EM78P568
8-bit OTP Micro-controller
__________________________________________________________________________________________________________________________________________________________________
* This specification are subject to be changed without notice.
01/31/2004 V4.7
VII.10 CTCSS block
VII.10.1 Block control and signal flow description
Audio
BPF
VRF
VRF
Rx AMP
MIC AMP
Z C
AURX/P65
RXO
RXI
MICI
MICO
Summing
AMP
MTX/P66
VRF
-10dB
0dB
ASW1
ASW2
RXPWR
LPFPWR
BPFPWR
Sub-Audio
LPF
ASW4
MUX
PORT66
MTX
MUX
PORT65
AURX
P65S
P66S
MUX
ASW3
MUX
MUX
MUX
DETO
TXPWR
TXPWR
RXPWR
VRX1
VTX1
VRX2
VTX2
VRX3
VTX3
VRX4
VTX4
(from DAC output buffer B2)
CTCSS tone input
MUX
MICO
AMUTE
Name
ASW1
ASW2
ASW3
ASW4
LPFPWR
BPFPWR
RXPWR
TXPWR
Register bit location
IOCE PAGE1 bit 0
IOCE PAGE1 bit 1
IOCE PAGE1 bit 2
IOCE PAGE1 bit 3
IOCE PAGE1 bit 4
IOCE PAGE1 bit 5
IOCE PAGE1 bit 6
IOCE PAGE1 bit 7
Name
P65S
P66S
AMUTE
DETO
Register bit location
IOC6 PAGE1 bit 5
IOC6 PAGE1 bit 6
IOC6 PAGE1 bit 7
R7 PAGE1 bit 6
CTCSS block on page 36 Fig.14 is the key feature for FRS baseband signal processing. For receiving path, it
receives the RF demodulator output signal and extract the audio output signal to AURX pin. Also it decodes
CTCSS tone and its decoding data is shown in the DETO. For transmitting path, it combines audio signal from
Mic Amp and CTCSS signal from DAC tone generator(as description in VII.9 section) thru MTX output to RF
modulator input end. CTCSS block consists of amplifiers, analog switch, filters and zero-crossing detector
which descriptions are shown below.
y
RX AMP : (Receiving amplifier) It accepts RF demodulator output signals which combine demodulated
audio and CTCSS tone. Its bias voltage is VDD/2.
y
MIC AMP : (Microphone amplifier) It is the audio input amplifier. Its bias voltage is VDD/2.
y
MUX : (Analog multiplexer switch) It is used for analog signal path switching.
y
Audio BPF : (Audio band pass filter) This audio BPF has pass band 300Hz ~ 3.4kHz. It is used to let audio
signal pass through and filter out CTCSS tones. It plays an important role in extracting audio signal. Also it
cut out unwanted signal while audio signal transmitting.
y
Sub-Audio LPF : (Sub-audio low pass filter) This sub-audio LPF has pass band 253Hz. It is used to let
CTCSS tone pass through and filters out audio signal. It plays an important in extracting CTCSS tone. Also
it cut out unwanted signal while CTCSS tone transmitting.
y
Summing AMP : (Summing amplifier) It is an analog signal mixer for audio signal and CTCSS tone
transmitting. CTCSS tone will be attenuated about 10dB before signal mixing.
y
ZC : (Zero-crossing detector) This detector transforms CTCSS tone signal from analog form to digital form.
It will be the CTCSS tone detection.
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