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參數(shù)資料
| 型號： | P83CL882 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 80C51 Ultra Low Power ULP telephony controller |
| 中文描述： | 80C51的超低功耗無鉛汽油電話控制器 |
| 文件頁數(shù)： | 56/88頁 |
| 文件大?。?/td> | 328K |
| 代理商： | P83CL882 |
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2001 Jun 19
56
Philips Semiconductors
Product specification
80C51 Ultra Low Power (ULP) telephony controller
P83CL882
6.9.1
80C51
MICROCONTROLLER INTERFACE
The MSK modem block interfaces to the microcontroller via the interrupt signals MRI and MTI and via the control and
data SFRs MCON, MSTAT and MBUF. The MSK modem receive and transmit registers are both accessed via the
Special Function Register MBUF. Writing to MBUF loads the transmit register and reading MBUF accesses a physically
separate receive register.
Table 68
MSK modem related SFRs
6.9.1.1
MSK Modem Control Register (MCON)
Table 69
MSK Modem Control Register (SFR address D3H)
Table 70
Description of MCON bits
Note
1.
If both the transmitter and the receiver are disabled (MTEN = 0 and MREN = 0), the clock of the MSK modem is
switched off. It is advised to use this state for power saving.
Table 71
Selection of the modems baud rates
SFR
DESCRIPTION
SFR ADDRESS
RESET VALUE
MCON
MSTAT
MBUF
MSK Modem Control Register
MSK Modem Status Register
MSK Modem Data Buffer
D3H
D2H
D1H
0000 0000
XX00 0000
0000 0000
7
6
5
4
3
2
1
0
MPR3
MPR2
MPR1
MPR0
MB1
MB0
MTEN
MREN
BIT
SYMBOL
DESCRIPTION
7
6
5
4
3
2
1
MPR3
MPR2
MPR1
MPR0
MB1
MB0
MTEN
Modem preamble pattern.
These 4 bits define the modems preamble pattern.
Modem transmit/receive frequency.
These 2 bits define the modem transmit/receive
frequency; see Table 71.
Modem Transmitter Enable.
If this bit is set the transmitter is active and MOUT[2:0] will
get the value ‘100’ if no data is transmitted. If reset, MOUT[2:0] will get the value ‘111’ to
zero the currents in the resistive DAC; see note 1.
Modem Receiver Enable.
If this bit is set the modem receiver is active and scans for
Manchester data; see note 1.
0
MREN
MB1
MB0
MODEM BAUD RATE
0
0
1
1
0
1
0
1
1
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