PCD6003 datasheet(40/96 Pages) PHILIPS

40 / 96 page

2001 Apr 17

Philips Semiconductors

Product speciﬁcation

Digital telephone answering machine chip

PCD6003

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.

PCD6003 Datasheet(PDF) 40 Page - NXP Semiconductors

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