C167CR
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).
ASC0 is upward compatible with the serial ports of the Siemens SAB 8051x microcontroller family
and support full-duplex asynchronous communication up to 625 KBaud and half-duplex
synchronous communication up to 2.5 Mbaud on the @ 20-MHz system clock.
The SSC allows half duplex synchronous communication up to 5 Mbaud @ 20-MHz system clock.
Two dedicated baud rate generators allow to set up all standard baud rates without oscillator tuning.
For transmission, reception, and erroneous reception 3 separate interrupt vectors are provided for
each serial channel.
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 + 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 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, while 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.
CAN-Module
The integrated CAN-Module handles the completely autonomous transmission and reception of
CAN frames in accordance with the CAN specification V2.0 part B (active), i.e. the on-chip CAN-
Module can receive and transmit standard frames with 11-bit identifiers as well as extended frames
with 29-bit identifiers.
The module provides Full CAN functionality on up to 15 message objects. Message object 15 may
be configured for Basic CAN functionality. Both modes provide separate masks for acceptance
filtering which allows to accept a number of identifiers in Full CAN mode and also allows to disregard
a number of identifiers in Basic CAN mode. All message objects can be updated independent from
the other objects and are equipped for the maximum message length of 8 bytes.
The bit timing is derived from the XCLK and is programmable up to a data rate of 1 MBaud. The
CAN-Module uses two pins to interface to a bus transceiver.
Semiconductor Group
25
INFINEON [ Infineon ]
