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C517A_99 Datasheet, PDF (146/218 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller
On-Chip Peripheral Components
C517A
Special Function Register S1CON (Address 9BH)
Special Function Register S1BUF (Address 9CH)
Reset Value : 0X000000B
Reset Value : XXH
Bit No.
9BH
MSB
7
SM
LSB
6
5
4
3
2
1
0
– SM21 REN1 TB81 RB81 TI1 RI1 S1CON
7
9CH
6
5
4
3
2
1
Serial Interface 1 Buffer Register
0
S1BUF
Bit
SM
SM21
REN1
TB81
RB81
TI1
RI1
Function
Serial port 1 mode select bit
SM = 0 : Serial mode A; 9-bit UART
SM = 1 : Serial mode B; 8-bit UART
Enable serial port 1 multiprocessor communication in mode A
If SM21 is set to 1 in mode A, RI1 will not be activated if the received 9th
data bit (RB81) is 0. In mode B, if SM21 = 1, RI1 will not be activated if
a valid stop bit was not received.
Enable receiver of serial port 1
Set by software to enable serial reception. Cleared by software to
disable reception.
Serial port 1 transmitter bit 9
TB81 is the 9th data bit that will be transmitted in mode A. Set or cleared
by software as desired.
Serial port 1 receiver bit 9
RB81 is the 9th data bit that was received in mode A. In mode B, if SM21
= 0, RB81 is the stop bit that was received.
Serial port 1 transmitter interrupt flag
TI1 is set by hardware at the beginning of the stop bit in any serial
transmission. TI1 must be cleared by software.
Serial port 1 receiver interrupt flag
RI1 is set by hardware at the halfway through the stop bit time in any
serial reception. RI1 must be cleared by software.
Semiconductor Group
6-80