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參數(shù)資料
| 型號： | PCD6003U |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | Digital telephone answering machine chip |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, UUC |
| 文件頁數(shù)： | 45/96頁 |
| 文件大?。?/td> | 385K |
| 代理商： | PCD6003U |
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2001 Apr 17
45
Philips Semiconductors
Product specification
Digital telephone answering machine chip
PCD6003
10.12.3 D
ATA RECEPTION
A message is received as a block of one or more data
bytes. When enabled, the receiver starts sampling MIN
and tries to detect a Manchester pattern. As soon as
3 consecutive Manchester bits are detected the receiver
clock is locked (MRL = 1) and the receiver starts scanning
the incoming data for the programmed Manchester
preamble pattern. When the modem recognizes the
preamble pattern, bit MRP is set to logic 1. If a
non-Manchester bit is detected before finding the
preamble pattern then MRL is reset and MRE is set to
logic 1. The synchronization process has to restart. If the
preamble pattern has been detected the receiver starts to
Manchester decode the incoming data bits and shifts them
into an internal register. After eight bits the contents of the
internal register are copied to MBUF and MRF bit is set to
logic 1. The received byte can be read from MBUF while
receiving continues in the internal register. If a
non-Manchester bit is received during data reception then
MRE is set to logic 1 and MRL and MRP are reset. The
receiver has to resynchronize before receiving new data.
Whenever one of the bits MRF, MRE, MRP and MRL is set
the MRI bit is also set and an MRI interrupt is generated.
This means that when an MRI interrupt occurs the 4 status
bits have to be polled by software. The bit MRL allows the
software to decide very quickly whether an occupied
channel contains Manchester coded data or not. The MRP
bit is used to find the start of data transmission in a
message that is repeated over and over again. MRE is
used to detect a Manchester error, which is a violation of
the Manchester coding rule that the received level should
changeinthemiddleofabitcell.TheMRFbitindicatesthat
the data in MBUF is ready to be read by the software.
During data reception the time between two settings of
MRF (each one generating an MRI interrupt) is;
baudrate
Figure 16 shows an example of the timing diagram of data
reception.
T
8
-----------1
×
=
handbook, full pagewidth
MGM780
data
37
data
AA
data
AD
data
1F
data
37
non-Manchester
(speech)
non-Manchester
(speech)
read
MBUF
1F
read
MBUF
37
clear
MRI
clear
MRI
clear
MRI
RX_MUTE should be
generated by microcontroller
upon interrupt
RX_MUTE should be
cleared by microcontroller
at end of message
write
MREN = 1
80C51
access
MIN
MRI
MRF
MRL
MRP
MRE
Fig.16 Data reception timing diagram.
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