TS80C32X2 ATMEL Corporation, TS80C32X2 Datasheet - Page 12

• Manufacturer Part Number: TS80C32X2
• Description: 8-bit Microcontroller ROMless
• Manufacturer: ATMEL Corporation

TS80C31X2
6.3 TS80C31X2 Serial I/O Port
The serial I/O port in the TS80C31X2 is compatible with the serial I/O port in the 80C31.
It provides both synchronous and asynchronous communication modes. It operates as an Universal Asynchronous
Receiver and Transmitter (UART) in three full-duplex modes (Modes 1, 2 and 3). Asynchronous transmission and
reception can occur simultaneously and at different baud rates
Serial I/O port includes the following enhancements:
6.3.1 Framing Error Detection
Framing bit error detection is provided for the three asynchronous modes (modes 1, 2 and 3). To enable the framing
bit error detection feature, set SMOD0 bit in PCON register (See Figure 4).
When this feature is enabled, the receiver checks each incoming data frame for a valid stop bit. An invalid stop
bit may result from noise on the serial lines or from simultaneous transmission by two CPUs. If a valid stop bit
is not found, the Framing Error bit (FE) in SCON register (See Table 5.) bit is set.
12
Framing error detection
Automatic address recognition
SM0/FE
SMOD1
SMOD0
SM1
Figure 4. Framing Error Block Diagram
SM2
-
REN
Set FE bit if stop bit is 0 (framing error) (SMOD0 = 1)
SM0 to UART mode control (SMOD = 0)
POF
To UART framing error control
TB8
GF1
RB8
GF0
PD
TI
IDL
RI
SCON (98h)
PCON (87h)
Rev. C - 15 January, 2001