參數(shù)資料
型號(hào)： PCD6001H
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, PQFP80
封裝： PLASTIC, QFP-80
文件頁(yè)數(shù)： 44/96頁(yè)
文件大小： 385K
代理商： PCD6001H
2001 Apr 17
44
Philips Semiconductors
Product specification
Digital telephone answering machine chip
PCD6001
10.12.2 D
ATA TRANSMISSION
DatatransmissionisenabledifbitMTENinregisterMCON
is set to logic 1. If MTEN is logic 0 data transmission is
disabled and MOUT[2:0] is set to <111> to zero the
currents in the resistive DAC. Setting MTEN to logic 1 sets
MOUT[2:0] to the Idle value <100>. This results in a value
close to 0.5V
DD
on the output signal of the external DAC.
Transmission is started by loading the first byte into
register MBUF. All bytes are transmitted starting with the
MSB.
A message is transferred in a block of 3 or more bytes, the
first two bytes being the programmed Manchester
preamble pattern. In order to insert the preamble pattern,
the first two bytes AAH and AxH (with x being the
MPR[3:0] values programmed in the receiver MSK
modem) have to be written to MBUF by software. After
this, the first byte of the message is written to MBUF.
As soon as MBUF is ready to accept new input, signal MTI
is set. A new byte written to MBUF automatically clears
MTI. The time between two MTI interrupts is:
baudrate
(e.g. for 1200 baud, T = 6.7 ms).
If no new byte is written to MBUF at the end of a byte
transmission, the modem transmitter stops transmission
and MOUT[2:0] is set to the Idle state <100>. In this case
MTI must be cleared explicitly. If MTEN is reset during
transmission, the transmitter will finish the transmission of
thecurrentbyteandthenwillsetMOUT[2:0]totheoffstate
<111>. No interrupt on MTI will be generated at the end of
the transmission.
During reception, a digital PLL re-synchronizes on the
active transition of every bit. This allows a continuous
transmission of long messages. Figure 15 shows a
possible timing diagram of data transmission.
T
8
-----------1
×
=
handbook, full pagewidth
MGM779
data ADH
data AAH
data AAH
data 55H
data 55H
write
MBUF
55H
write
MBUF
55H
80C51
access
MOUT
MTI
TX_MUTE
set
MTEN
clear
MTI
write
MBUF
AAH
write
MBUF
AAH
write
MBUF
ADH
Fig.15 Data transmission timing diagram.
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