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參數(shù)資料
| 型號： | PCD6001U |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 通信及網(wǎng)絡 |
| 英文描述： | Digital telephone answering machine chip |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, UUC |
| 文件頁數(shù)： | 40/96頁 |
| 文件大?。?/td> | 385K |
| 代理商： | PCD6001U |
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2001 Apr 17
40
Philips Semiconductors
Product specification
Digital telephone answering machine chip
PCD6001
10.12 MSK modem
The MSK modem is used for in-band signalling between
handset and base in analog cordless telephone systems
CT0, CT1 and CT1+. The MSK modems receiver and
transmitter can be enabled separately. Receive and
transmit interrupts can wake-up the microcontroller during
its power saving Idle mode. The baud rates are
programmable between 1200 and 4800 baud. Figure 14
shows the functional diagram of the MSK modem.
The MIN input is the alternative input of P3.7 and
MOUT[2:0] is the alternative output of P3.0, P3.1 and
P3.6. The RX and TX mute can be done in software by any
pin of MA, P1, P3 and P2. The MTI and MRI interrupts are
OR-ed together to a single interrupt called msk_int. So the
msk_in interrupt handler should investigate the status of
the MRI and MTI bit in the MCON SFR.
The MOUT[2:0] outputs and the MIN input are alternative
functions of P3.0, P3.1, P3.6 and P3.7. The MOUT[2 :0]
outputs are ‘111’ when the MSK transmitter is disabled
(default after reset). Therefore, P3.0, P3.1, P3.6 and P3.7
can still be used as general purpose I/O ports. Setting bit 7
of MSTAT will invert the MIN polarity.
The modem has the following features:
Full-duplex operation via 8-bit parallel interface; the
message is fully Manchester coded/decoded
Automatic detection of 16 bit Manchester preamble
pattern
The last received 4 bits of the preamble pattern are
programmable
Receiver full, transmitter empty indication bits
Manchester coding and decoding for clock recovery and
early error detection
Programmable input polarity
Baud rate selection from 1200, 2400, 3600
and 4800 baud with internal modem timer
Receiver and transmitter off-states with no power
consumption.
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