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參數(shù)資料
| 型號(hào)： | P83CL882 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 80C51 Ultra Low Power ULP telephony controller |
| 中文描述： | 80C51的超低功耗無(wú)鉛汽油電話控制器 |
| 文件頁(yè)數(shù)： | 60/88頁(yè) |
| 文件大小： | 328K |
| 代理商： | P83CL882 |
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2001 Jun 19
60
Philips Semiconductors
Product specification
80C51 Ultra Low Power (ULP) telephony controller
P83CL882
6.9.5
D
ATA TRANSMISSION
DatatransmissionisenabledifbitMTENinregisterMCON
is set to a logic 1. If MTEN is a 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 a logic 1
sets MOUT[2:0] to the idle value ‘100’. This results in
a value close to
1
/
2
V
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
MPR3 to MPR0 value 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.
The minimum time between two MTI interrupts is:
8
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’.
MTI must be cleared explicitly. If MTEN is reset during
transmission, the transmitter will finish the transmission of
the current byte and then will set MOUT[2:0] to the off
state ‘111’. No interrupt on MTI will be generated at the
end of the transmission.
t
min
baud rate
=
handbook, full pagewidth
MGK229
MOUT
80C51
access
set
MTEN
clear
MTI
write
MBUF
AAH
write
MBUF
ADH
write
MBUF
AAH
write
MBUF
55H
write
MBUF
55H
MTI
TX_MUTE
data ADH
data AAH
data AAH
data 55H
data 55H
Fig.28 Data transmission timing diagram.
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