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參數(shù)資料
| 型號： | AM79C30AVC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | Digital Subscriber Controller⑩ (DSC⑩) Circuit |
| 中文描述： | DATACOM, DIGITAL SLIC, PQFP44 |
| 封裝： | PLASTIC, TQFP-44 |
| 文件頁數(shù)： | 26/101頁 |
| 文件大小： | 1607K |
| 代理商： | AM79C30AVC |
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26
Am79C30A/32A Data Sheet
6. The peak registers are double-buffered and can be
read asynchronously to the operation of the DSP
register. They are cleared on read.
7. The peak registers default to “don't care” values
when the part is reset. An initial read operation is re-
quired to clear the register before using it for the first
time.
The PEAKX register is at indirect address 70H, while
the PEAKR register is at indirect address 71H. Both
may be accessed via back-to-back read data register
operations by loading the command register with 72H.
Tone Generators
The MAP contains three tone generators which can be
enabled via MAP Mode Register 2, bits 2, 3, and 4.
Only one of the three tone generator bits in the register
can be set at a time. If more than one bit is set, all three
bits are considered set to zero and tone generation is
disabled. The tone generators are:
DTMF Generator
This generator provides tone injection at a sampling
rate of 32 kHz into the transmit and sidetone paths (Fig-
ure 3, Block A). The DTMF frequencies generated are
guaranteed to ±1.2% deviation.
The DTMF generator may be used to generate single
frequency outputs. To obtain a single frequency out of
the DTMF generator, load a zero code into one of the
two frequency registers.
Tone Generation
This generator provides call progress tones to the re-
ceive path, where it is added to the incoming speech
(Figure 3, Block B).
Tone Ringer
This generator provides tone alert signals output
through the receive path to the loudspeaker or ear-
piece (Figure 3, Block C).
To program the DTMF tone generators, two frequency
values and two amplitude values must be written to the
two 8-bit Frequency Tone Generator Registers
(FTGR1, FTGR2) and the two 8-bit Amplitude Tone
Generator Registers (ATGR1, ATGR2), respectively.
The Tone Generator and the Tone Ringer use the fre-
quency programmed in FTGR1. The Tone Generator
uses the amplitude programmed in ATGR1 while the
Tone Ringer uses the amplitude programmed in ATGR2.
Common frequency values are listed in Table 22.
The FTGR codes to obtain DTMF dialing output fre-
quencies are listed in Table 21.
Table 21.
DTMF Codes
9BH
ABH
BFH
D3H
FTGR 1 or 2
FREQ
1209
1336
1477
1633
5AH
697
1
2
3
A
63H
770
4
5
6
B
6EH
852
7
8
9
C
79H
941
*
0
#
D
HEX REG VALUE
FTGR 2 or 1
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