PCD6003 datasheet(43/96 Pages) PHILIPS

43 / 96 page

2001 Apr 17

Philips Semiconductors

Product speciﬁcation

Digital telephone answering machine chip

PCD6003

Table 43 Description of MSTAT bits

10.12.1.3 MSK Modem Data Buffer (MBUF)

Table 44 MSK Modem Data Buffer (SFR address C9H)

Table 45 Description of MBUF bits

BIT

SYMBOL

DESCRIPTION

MPOL

MIN polarity switch. If MPOL = 1, the value of the MIN pin is inverted before being

applied to the MSK block.

MRF

Modem receiver full ﬂag. This bit is set when MBUF holds a newly received byte. MRF

is reset if the receiver is disabled (MREN = 0) or by reading MBUF. This bit is read-only.

Writing to it will have no effect.

MRE

Modem Receiver Error ﬂag. Indicates the reception of a non-Manchester bit. This bit is

set by hardware and is reset by reading MBUF, by disabling the receiver (MREN = 0) or

by resetting MRI. This bit is read-only. Writing to it will have no effect.

MRP

Modem Receiver Preamble ﬂag. This bit is set by hardware when the modem

recognized the programmed preamble pattern (AAAH, MPR3 to MPR0) after locking the

receiver clock (MRL = 1). MRP is reset by hardware if the receiver is disabled

(MREN = 0) or if non-Manchester data is received (MRE = 1). This bit is read-only.

Writing to it will have no effect.

MRL

Modem Receiver Clock Locked ﬂag. This bit is set when the clock of the receiver is

locked, i.e. when the receiver has detected Manchester data but has not found the

preamble pattern yet. MRL is reset when the receiver detects a non-Manchester bit or

when the receiver is disabled. This bit is read-only. Writing to it will have no effect.

MTI

Modem Transmit Interrupt ﬂag. Indicates MBUF is empty to accept a new byte for

transmission. This bit is reset by writing to MBUF or by writing a 0 to it. Writing a 1 to

MTI will set the bit. This allows to generate a hardware interrupt by software.

MRI

Modem Receive Interrupt ﬂag. Indicates:

Modem Receiver Full (MRF = 1) or

Modem Receiver Error (MRE = 1) or

Modem Receiver Preamble (MRP = 1) or

Modem Receiver Clock Locked (MRL = 1)

This bit is reset by reading MBUF or by writing a logic 0 to MRI. A reset of MRI will also

reset MRE. Writing a logic 1 to MRI will have no effect.

76543210

BIT

SYMBOL

DESCRIPTION

7 to 0

D7 to D0

Writing to MBUF will load the data in the transmit buffer and automatically start a

transmission at MOUT if the transmitter is enabled (MTEN = 1). A new byte can be

loaded after MTI is set. If a new byte is loaded before the setting of MTI then the

previous byte will be lost. After data has been received at MIN, indicated by MRI, the

received byte can be read from MBUF.

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