SAB-C509-LM SIEMENS [Siemens Semiconductor Group], SAB-C509-LM Datasheet - Page 52

• Manufacturer Part Number: SAB-C509-LM
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Table 12 below lists the values/formulas for the baud rate calculation of serial interface 0 and 1 with
its dependencies of the control bits BD, SMOD, S0P, and S1P.
Table 12
Serial Interface 0 - Baud Rate Dependencies
Serial Interface 0
Operating Modes
Mode 0 (Shift Register)
Mode 1 (8-bit UART)
Mode 3 (9-bit UART)
Mode 2 (9-bit UART)
Mode A (9-bit UART)
Mode B (8-bit UART)
Semiconductor Group
BD
–
0
1
–
–
Active Control Bits
S0P
–
0 or 1
–
–
–
SMOD S1P
–
0 or 1
0 or 1
0
1
–
51
–
–
–
–
0 or 1
Baud Rate Calculation
Controlled by timer 1 overflow :
(2
Controlled by baud rate generator :
(2
(64
(2
(32
f
f
f
OSC
OSC
OSC
SMOD
S0P
S1P
/ 6
/ 32
/ 16
baud rate generator overflow rate)
baud rate generator overflow rate)
2
f
OSC
SMOD
timer 1 overflow rate) / 32
) /
f
OSC
) /
C509-L
09.96