參數(shù)資料
型號(hào)： P87C51SBBB
廠(chǎng)商： NXP SEMICONDUCTORS
元件分類(lèi)： 微控制器/微處理器
英文描述： DC DOOR SIESMIC CAB, GRAY, 70
中文描述： 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PQFP44
封裝： 10 X 10 MM, 1.75 MM HEIGHT, PLASTIC, SOT307-2, QFP-44
文件頁(yè)數(shù)： 15/34頁(yè)
文件大小： 394K
代理商： P87C51SBBB
2001 Apr 06
15
Philips Semiconductors
Preliminary specification
P87C51MB2/P87C51MC2
80C51 8-bit microcontroller family with extended memory
64KB/96KB OTP with 2KB/3KB RAM
UARTS
P87C51Mx2 includes two enhanced UART ports with one independent Baud Rate Generator:
UART 0 is the standard 51MX enhanced UART as described in the User Manual. It can be selected to use Timer1 overflow,
Timer2 overflow or the independent Baud Rate Generator.
UART 1 only uses the independent Baud Rate Generator to generate its baud rate. It has the same baud rate for both
transmission and reception.
The Baud Rate Generator is described in the User Manual.
Each of the UARTs has one set of enhanced UART SFRs. Please refer to the descriptions on the corresponding SFRs in the
User Manual:
PCON.7 and PCON.6 SFR Bits
The PCON.7 and PCON.6 SFR bits configure the UARTs as follows:
PCON.7 (SMOD1) - Baud Rate Control bit for serial port 0. When 0, the baud rate for UART 0 will be the input rate (T1 timer
or baud rate generator, as determined by the BRGCON extended SFR) divided by two. When 1, the baud rate for UART 0 will
be the input rate (T1 timer or baud rate generator). UART 1 is not affected by this bit
PCON.6 (SMOD0) - Framing Error Location:
- When 0, bit 7 of S0CON and S1CON will function as SM0 for UARTs 0 and 1 respectively.
- When 1, bit 7 of S0CON and S1CON will be used for framing error status for UART 0 and 1 respectively.
PCON.6 also determines when the UART receive interrupts RI_0 and RI_1 occur in UART modes 2 or 3. (Refer to User
Manual for details.)
Register
Description
SFR Location
51MX Extended SFR
Location
See Description in
User Manual on
S0CON
Serial Port 0 Control
98H
SCON
S0BUF
Serial Port 0 Data Buffer
99H
SBUF
S0ADDR
Serial Port 0 Address
A9H
SADDR
S0ADEN
Serial Port 0 Address Enable
B9H
SADEN
S0STAT
Serial Port 0 Status
8CH
SSTAT
S1CON
Serial Port 1 Control
80H
SCON
S1BUF
Serial Port 1 Data Buffer
81H
SBUF
S1ADDR
Serial Port 1 Address
82H
SADDR
S1ADEN
Serial Port 1 Address Enable
83H
SADEN
S1STAT
Serial Port 1 Status
84H
SSTAT
Table 3: UARTs 0 and 1 SFRs.
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