SAB80C517-M16 SIEMENS [Siemens Semiconductor Group], SAB80C517-M16 Datasheet - Page 52

• Manufacturer Part Number: SAB80C517-M16
• Description: 8-Bit CMOS Single-Chip Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Figure 7-8
Special Function Register S0CON (Address 98 H )
Bit
SM0
Semiconductor Group
0
0
1
1
SM20
REN0
RB80
TB80
98 H
RI0
TI0
SM0
9F H
SM1
0
1
0
1
9E H
SM1
Symbol
Serial mode 0:
Serial mode 1:
Serial mode 2:
Serial mode 3:
Enables the multiprocessor communication feature in modes 2 and 3. In
mode 2 or 3 and SM20 being set to 1, RI0 will not be activated if the
received 9th data bit (RB80) is 0. In mode 1 and SM20 = 1, RI0 will not
be activated if a valid stop bit has not been received. In mode 0, SM20
should be 0.
Receiver enable. Enables serial reception. Set by software to enable
reception. Cleared by software to disable reception.
Transmitter bit 8. Is the 9th data bit that will be transmitted in modes 2
and 3. Set or cleared by software as desired.
Receiver bit 8. In modes 2 and 3 it is the 9th bit that was received. In
mode 1, if SM20 = 0, RB80 is the stop bit that was received. In mode 0,
RB80 is not used.
Transmitter interrupt. Is the transmit interrupt flag. Set by hardware at
the end of the 8th bit time in mode 0, or at the beginning of the stop bit
in the other modes, in any serial transmission. Must by cleared by
software.
Receiver interrupt. Is the receive interrupt flag. Set by hardware at the
end of the 8th bit time in mode 0, or during the stop bit time in the other
modes, in any serial reception. Must be cleared by software.
9D H
SM20
REN0
9C H
Shift register mode, fixed baud rate
8-bit UART, variable baud rate
9-bit UART, fixed baud rate
9-bit UART, variable baud rate
53
9B H
TB80
On-Chip Peripheral Components
9A H
RB80
99 H
TI0
98 H
RI0
S0CON