Electronics

SCI: Serial Communications Interface (Asynchronous)

The Serial Communications Interface (SCI) is an independent serial I/O subsystem (full-duplex UART-type asynchronous system). The SCI can be used for communications between the microcontroller and a terminal, PC, or other microcontrollers in the form of a network. An on-chip baud rate generator derives standard baud-rate frequencies from the microcontroller oscillator. A typical SCI application is long-distance communications (RS-232).

SCI+: Serial Communications Interface (Asynchronous and Synchronous)

The SCI+ is similar to the SCI with additional support for synchronous serial communications. A transmitter clock output is used to transfer data synchronously to SPI like peripherals.

SIM: System Interface Module

The System Interface Module (SIM) functions as a system state controller handling CPU event timing with internal and external modules as well as exception control timing. Some of the SIM's responsibilities include control of mode selection, master reset control, bus clock generation, STOP/WAIT/RESET entry and recovery, and control of interrupt execution and timing.

SIOP: Simple Serial I/O Port (Synchronous)

The Simple Serial I/O Port (SIOP) is a simpler implementation of the SPI. The serial clock has fixed polarity and no slave select pin is provided.

Some properties of the CAN protocol:

· CAN is a multi-master protocol which utilizes non-destructive collision resolution to ensure the highest priority message is transmitted

· The message prioritization is defined by the user, with a guaranteed maximum latency for the highest priority messages

· A flexible system configuration allows the user to create the network which best fits the application

· Error detection and error signaling features are built into the CAN protocol, along with automatic retransmission of corrupted messages

· A distinction between temporary errors and permanent node failures prevents faulty nodes from causing long-term disruptions of network traffic

CAN Specification ver. 2.0: The most recent version of the CAN specification is version 2.0, released in 1991. This version is divided into 2 parts, cleverly named Part A and Part B. Part A is simply a restatement of the previous revision (version 1.2), while Part B adds the definition of the 29-bit Extended Identifier message format to the existing 11-bit Standard Identifier message format defined in the earlier CAN specifications.

Speed Advantage of Laser Plotters

Laser plotters operate much quicker than vector machines. A complex plot that required hours on a vector machine can usually be performed in ten minutes or less on a laser Photoplotter. This decreases turnaround time and in many markets has driven Photoplotting costs down.

SPI: Serial Peripheral Interface (Synchronous)

The Serial Peripheral Interface (SPI) is similar to the SCI, although it is used to communicate synchronously over shorter distances at up to 4 Mbit/s. The SPI allows the microcontroller to communicate with peripheral devices, which could be anything from a simple TTL shift register to a complete subsystem such as an LCD display or an A/D converter system. The SPI is flexible enough to interface directly with numerous standard peripherals from many manufacturers. SPIs can also be used to expand the number of inputs and outputs of the microcontroller with the minimum number of pins. Typical applications are in peripheral communications.

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