p87c51mc2 NXP Semiconductors, p87c51mc2 Datasheet - Page 15

• Manufacturer Part Number: p87c51mc2
• Description: 80c51 8-bit Microcontroller Family With Extended Memory
• Manufacturer: NXP Semiconductors

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,
• UART 1 only uses the independent Baud Rate Generator to generate its baud rate. It has the same baud rate for both
• 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:
Table 3: UARTs 0 and 1 SFRs.
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
• PCON.6 (SMOD0) - Framing Error Location:
2001 Apr 06
Philips Semiconductors
80C51 8-bit microcontroller family with extended memory
64KB/96KB OTP with 2KB/3KB RAM
Timer2 overflow or the independent Baud Rate Generator.
transmission and reception.
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
- 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.
S0ADDR
S1ADDR
S0ADEN
S1ADEN
Register
S0STAT
S1STAT
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.)
S0CON
S1CON
S0BUF
S1BUF
Serial Port 0 Control
Serial Port 0 Data Buffer
Serial Port 0 Address
Serial Port 0 Address Enable
Serial Port 0 Status
Serial Port 1 Control
Serial Port 1 Data Buffer
Serial Port 1 Address
Serial Port 1 Address Enable
Serial Port 1 Status
Description
SFR Location
A9H
B9H
98H
99H
15
51MX Extended SFR
Location
8CH
80H
81H
82H
83H
84H
P87C51MB2/P87C51MC2
Preliminary specification
See Description in
User Manual on
SADDR
SADDR
SADEN
SADEN
SSTAT
SSTAT
SCON
SCON
SBUF
SBUF