參數(shù)資料
型號(hào)： MSM7564-01
廠商： OKI SEMICONDUCTOR CO., LTD.
英文描述： CONNECTOR ACCESSORY
中文描述： 連接器附件
文件頁(yè)數(shù)： 11/28頁(yè)
文件大?。?/td> 198K
代理商： MSM7564-01
Semiconductor
MSM7564-01
11
Serial Interface
MSM7564 provides a one channel serial interface, including synchronous-asynchronous and
asynchronous-synchronous converters. Select synchronous or asynchronous. In synchronous mode,
the transmit data is synchronized with the clock provided from this chip or DTE. Serial transmit data
to STD pin is latched with the rising edge of ST1 or ST2, and receive data on SRD is output
synchronously with the falling edge of RT. This chip also includes a scrambler and descrambler.
Parallel Interface
MSM7564 contains twenty 8-bit registers (location from addresses 00H through 0FH and 1C through
1F), which are used to control this chip and to detect various signals. Connect this chip to either
multiplexed address and data bus such as Intel-compatible (80 mode) or separate address and data
bus such as Motorola-compatible (68 mode).
Transmit and Receive Level
Analog input and output are differential amplifiers, and are
±
1.2 V
O-P
peak signals. The level of the
transmit line signal is –10 dBm. The modem can provide 15 dB programmable transmit attenuation
with 1 dB steps controlled by the TXLEV bit in located 0BH register. Receive signal level is from –10
dBm to –43 dBm. Carrier detection level can be selected from 4 levels (–43, –33, –26, –16 dBm) by the
CDLEV bit located in register 0BH. An amplitude equalizer in transmitter and receiver can be
individually controlled by RAEQL and SAEQL bits in register 07H.
DTMF Tone, Answer Tone, and Guard Tone Generators
The modem can generate 16 types of DTMF tones using the PBANSEL bit located in register 05H.
It also generates answer tone and guard tone.
Various Detection Circuits
The internal detection circuit monitors carrier, call progress tone, answer tone, DTMF tone, and other
receive signals needed for each modem mode, and stores them in the corresponding bits of each of
the following registers : 0C, 0D, 1C, and 1D. Classification of detected tones is controlled by
DETMODE bit in register 08H. If the contents of registers 0C, 0D, 1C, and 1D change, the interruption
signal (STCHG) for controlling microprocessor is generated.
Programmable Tone Generator and Detector
The transmission of programmable tone 1 and tone 2 is available and is controlled by PTONE1 and
PTONE2 bits in 05H register. To use this function, the initial download of frequency and gain is
needed. This modem can output 16 kinds of frequency selected by PBANSEL bit of register 05H
(composition of two tones is also available.). PTONE1 and PTONE2 are the same frequency and only
the gain is variable. Each bit of D7, D6, D3, D2, D1, and D0 in register 0C can be used for
programmable tone detecting by rewriting a coefficient of internal filter at the initial download.
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