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| 型号： | SI2401FS08-EVB |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 25/76页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL SI2401 + SI3008 |
| 标准包装： | 1 |
| 系列： | ISOmodem® |
| 主要目的： | 电信，数据采集装置（DAA） |
| 已用 IC / 零件： | SI2401 |
| 已供物品： | 板，CD |
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Si2401
Rev. 1.0
31
6. Low Level DSP Control
Although not necessary for most applications, the DSP
low-level control functions are available for users with
very specific applications requiring direct DSP control.
6.1. DSP Registers
Several DSP registers are accessible through the
Si2401 microcontroller via S-registers SE5, SE6, and
SE8. SE5 and SE6 are used as conduits to write data to
specific DSP registers and read status. SE8 defines the
function of SE5 and SE6 depending on whether they
are being written to or read from. Care must be
exercised when writing to DSP registers. DSP registers
can only be written while the Si2401 is on-hook and in
the command mode. Writing to any register address not
is likely to cause the DSP to exhibit unpredictable
behavior.
The DSP register address is 16-bits wide, and the DSP
data field is 14-bits wide. DSP register addresses and
data are written in hexadecimal. To write a value to a
DSP register, the register address is written, and then
the data is written. When SE8 = 0x00, SE5(DADL) is
written with the low bits [7:0] of the DSP register
address, and SE6 (DADH) is written with the high bits
[15:8]
of
the
DSP
address.
When
SE8 = 0x01,
SE5 (DDL) is written with the low bits [7:0] of the DSP
data word corresponding to the previously written
address, and SE6 (DDH) is written with the high bits
[15:8] of the data word corresponding to the previously
written address. Example 1 illustrates the proper
procedure for writing to DSP registers.
Example1:
The user would like to program call
progress filter coefficient A2_k0 (0x15) to be 309
(0x135).
Host Command:
ATSE8=00SE6=00SE5=15SE8=01SE6=01SE5=35SE8=00
In this command, ATSE8=00 sets up registers SE5 and
SE6 as DSP address registers. SE6=00 sets the high
bits of the address, and SE5=15 sets the low bits.
SE8=01 sets up registers SE5 and SE6 as DSP data
registers for the previously-written DSP address (0x15).
SE6=01 sets the six high bits of the 14-bit data word,
and SE5=35 sets the eight low bits of the 14-bit data
word.
Table 17. DTMF Values
DTMF
Code
Keyboard
Equivalent
Contact
ID
Digit
Tones
Low
High
0
941
1336
1
697
1209
2
697
1336
3
697
1477
4
770
1209
5
770
1336
6
770
1477
7
852
1209
8
852
1336
9
852
1477
10
D
–
941
1633
11
*
B
941
1209
12
#
C
941
1477
13
A
D
697
1633
14
B
E
770
1633
15
C
F
852
1633
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