SAB-C509-LM SIEMENS [Siemens Semiconductor Group], SAB-C509-LM Datasheet - Page 50

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

Serial Interfaces 0 and 1
The C509-L has two serial interfaces which are functionally nearly identical concerning the
asynchronous modes of operation. The two channels are full-duplex, meaning they can transmit
and receive simultaneously. The serial channel 0 is completely compatible with the serial channel
of the C501 (one synchronous mode, three asynchronous modes). Serial channel 1 has the same
functionality in its asynchronous modes, but the synchronous mode and the fixed baud rate UART
mode is missing.
The operating modes of the serial interfaces is illustrated in table 11. The possible baudrates can
be calculated using the formulas given in table 12.
Table 11
Operating Modes of Serial Interface 0 and 1
Serial
Interface
0
1
Semiconductor Group
Mode
0
1
2
3
A
B
SM0
0
0
1
1
–
–
S0CON
SM1
0
1
0
1
–
–
S1CON Description
SM
–
–
–
–
0
1
49
Shift register mode
Serial data enters and exits through R D0;
T D0 outputs the shift clock; 8-bit are
transmitted/received (LSB first); fixed baud rate
8-bit UART, variable baud rate
10 bits are transmitted (through T D0) or
received (at R D0)
9-bit UART, fixed baud rate
11 bits are transmitted (through T D0) or
received (at R D0)
9-bit UART, variable baud rate
Like mode 2
9-bit UART; variable baud rate
11 bits are transmitted (through T D1) or
received (at R D1)
8-bit UART; variable baud rate
10 bits are transmitted (through T D1) or
received (at R D1)
C509-L
09.96