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參數(shù)資料
| 型號(hào)： | HSCANDXTCSSCODING |
| 英文描述： | CMX866 Operation with Low Level Commands |
| 中文描述： | CMX866操作水平低命令 |
| 文件頁數(shù)： | 4/7頁 |
| 文件大?。?/td> | 74K |
| 代理商： | HSCANDXTCSSCODING |
CMX866 Operation with Low-Level Commands
Page 4 of 7
Once this is done, the CMX866 Transmit Mode register should be loaded with a
value that will select the Programmable Tone Generation mode and the desired
“
Tone Pair
”
to be generated.
The following AT commands demonstrate how the CMX866 can be configured to
transmit:
a 400Hz tone @ 1V
rms
.
a 900Hz tone at 0.75V
rms
.
tone pair TA location selected.
This example presumes the Programming Flag bit in the Status Register is set to 1
before writes are made to the Programming Register.
AT@RE8=32768<CR>
Resets the Programming Register increment pointer.
AT@RE8=1366<CR>
Selects 400Hz frequency for TA Tone 1.
AT@RE8=18756<CR>
Selects 1Vrms amplitude (at Vdd=5.0V) for TA Tone 1.
AT@RE8=3073<CR>
Selects 900Hz frequency for TA Tone 2.
AT@RE8=14067<CR>
Selects 0.75Vrms amplitude (at Vdd=5.0V) for TA Tone 2.
(If no other tones are to be programmed, no further writes to the Programming
Register are required.)
Next, to configure the CMX866 transmit circuitry for Programmable Tone Generation
mode:
AT@RE1=4108<CR>
“
E1
”
is the hexadecimal address for the CMX866 Transmit Mode register, and 4108
d
($100C) represents the contents to be loaded into this register. Mapping the 4108
d
value to the description of the CMX868 Transmit Mode register indicates that the
following actions will occur:
DTMF/Tones mode (b15-12=0001)
-10.5dB internally provided Tx gain (b11-9=000)
Programmed Tone Pair mode (b8-5=0000, b4=0)
Tone Pair TA selected (b3-0=1100)
The desired tone pair should now be observed on the TXA or TXAN output pins of
the CMX866.
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