參數(shù)資料
型號(hào)： EM78568
廠商： Electronic Theatre Controls, Inc.
英文描述： 8-BIT MICRO-CONTROLLER for FRS
中文描述： 8位微控制器為FRS
文件頁(yè)數(shù)： 41/54頁(yè)
文件大?。?/td> 494K
代理商： EM78568
EM78568
8-bit Micro-controller for FRS
__________________________________________________________________________________________________________________________________________________________________
* This specification are subject to be changed without notice.
07/28/2004 V3.5
VII.10 Signal and control paths for DAC, DAC tone gen., CTCSS and Comparator
Volgage reference control logic
DAC Tone
Gen.
R-2R
fm =
447.829kHz
MUX
DA7~DA0
DAT/DAD
DAT7~DAT0
DAST/P67
PORT67
DAO/P67
DATEN
MUX
2.5V
ref
VDD
MUX
VDD
VRSEL
(part of Comparator)
MUX
ASW3
To ladder resistors
To Sub-Audio LPF
(part of CTCSS)
VTX3
VRX3
DAC
DAC Tone Gen.
B2
B1
CMPEN
Name
DAT7 ~ DAT0 RE PAGE1 bit 7 ~ 0
DA7 ~ DA0
RA PAGE1 bit 7 ~ 0
Register bit location
ASW3
DATEN
DAST/P67
VREF
CMPEN
VRSEL
REFSEL
REFEN
REFSEL
REFEN
Name
DAST/P67
VRSEL
DATEN
VREF
DAT/DAD
CMPEN
ASW3
Register bit location
IOCA PAGE1 bit 3
IOCA PAGE1 bit 4
IOCA PAGE1 bit 5
IOCA PAGE1 bit 6
IOCA PAGE1 bit 7
IOC5 PAGE1 bit 7
IOCE PAGE1 bit 2
ps.
REFEN, REFSEL are not register bits.
Fig.16 Signal and control paths for analog circuit
The Fig.16 above try to explain how to use built-in 8-bit R-2R DAC. This DAC can be used as general DAC; here
is call “DAC general mode”. Also it can be used as FRS CTCSS tone generation; here is called DAC tone generator
mode. When you use DAC general mode, you have to software program DAC input data DA7 ~ DA0 bits with
different points of value for tone generation. When you use DAC tone generator mode, you just need to set DAT7 ~
DAT0 bits and then the hardware “DAC Tone Gen.” will auto-program DAC to generate corresponding frequency
signal output. Using this feature, it is easy and software free to generate accurate CTCSS tone.
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