SAB-C161K-L16M SIEMENS [Siemens Semiconductor Group], SAB-C161K-L16M Datasheet - Page 20

• Manufacturer Part Number: SAB-C161K-L16M
• Description: 16-Bit CMOS Single-Chip Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

C161
1996 Intermediate Version
Serial Channels
Serial communication with other microcontrollers, processors, terminals or external peripheral
components is provided by two serial interfaces with different functionality, an Asynchronous/
Synchronous Serial Channel (ASC0) and a High-Speed Synchronous Serial Channel (SSC).
The ASC0 is upward compatible with the serial ports of the Siemens 8-bit microcontroller families
and supports full-duplex asynchronous communication at up to 500 KBaud and half-duplex
synchronous communication at up to 2 MBaud @ 16 MHz CPU clock.
A dedicated baud rate generator allows to set up all standard baud rates without oscillator tuning.
For transmission, reception and error handling 4 separate interrupt vectors are provided. In
asynchronous mode, 8- or 9-bit data frames are transmitted or received, preceded by a start bit and
terminated by one or two stop bits. For multiprocessor communication, a mechanism to distinguish
address from data bytes has been included (8-bit data plus wake up bit mode).
In synchronous mode, the ASC0 transmits or receives bytes (8 bits) synchronously to a shift clock
which is generated by the ASC0. The ASC0 always shifts the LSB first. A loop back option is
available for testing purposes.
A number of optional hardware error detection capabilities has been included to increase the
reliability of data transfers. A parity bit can automatically be generated on transmission or be
checked on reception. Framing error detection allows to recognize data frames with missing stop
bits. An overrun error will be generated, if the last character received has not been read out of the
receive buffer register at the time the reception of a new character is complete.
The SSC supports full-duplex synchronous communication at up to 4 Mbaud @ 16 MHz CPU clock.
It may be configured so it interfaces with serially linked peripheral components. A dedicated baud
rate generator allows to set up all standard baud rates without oscillator tuning. For transmission,
reception and error handling 3 separate interrupt vectors are provided.
The SSC transmits or receives characters of 2...16 bits length synchronously to a shift clock which
can be generated by the SSC (master mode) or by an external master (slave mode). The SSC can
start shifting with the LSB or with the MSB and allows the selection of shifting and latching clock
edges as well as the clock polarity.
A number of optional hardware error detection capabilities has been included to increase the
reliability of data transfers. Transmit and receive error supervise the correct handling of the data
buffer. Phase and baudrate error detect incorrect serial data.
Semiconductor Group
19