C508_01 Datasheet, PDF (169/267 Pages) Infineon Technologies AG – 8-Bit CMOS Microcontroller

C508
On-Chip Peripheral Components
Special Function Register SCON (Address 98_H)
Special Function Register SBUF (Address 99_H)
Reset Value: 00_H
Reset Value: XX_H
Bit No. MSB
LSB
9F_H 9E_H 9D_H 9C_H 9B_H 9A_H 99_H 98_H
98_H SM0 SM1 SM2 REN TB8 RB8 TI
RI SCON
7
99_H
6
5
4
3
2
1
Serial Interface Buffer Register
0
SBUF
Bit
SM0
SM1
SM2
REN
TB8
RB8
Function
Serial Port 0 operating mode selection bits
SM0
0
0
1
1
SM1
0
1
0
1
Selected operating mode
Serial mode 0: Shift register, fixed baudrate (f_OSC/3)
Serial mode 1: 8-bit USART, variable baudrate
Serial mode 2: 9-bit USART, fixed baudrate (f_OSC/8 or
f_OSC/16)
Serial mode 3: 9-bit USART, variable baudrate
Enable serial port multiprocessor communication in Modes 2 and 3
In Mode 2 or 3, if SM2 is set to 1, then RI will not be activated if the
received 9^th data bit (RB8) is 0. In Mode 1, if SM2 = 1 then RI will not be
activated if a valid stop bit is not received. In Mode 0, SM2 should be 0.
Enable receiver of serial port
Set by software to enable serial reception. Cleared by software to disable
serial reception.
Serial port transmitter bit 9
TB8 is the 9^th data bit that will be transmitted in Modes 2 and 3. Set or
cleared by software as desired.
Serial port receiver bit 9
In Modes 2 and 3, RB8 is the 9^th data bit that is received. In Mode 1, if
SM2 = 0, RB8 is the stop bit that is received. In Mode 0, RB8 is not used.
User’s Manual
6-104
2001-05