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Microcontrollers are very useful in any application in which many decisions or calculations are required. In most cases, it is easier to use the computational power of an MCU rather than use discrete logic. One key advantage of an MCU system is the opportunity to use software to replace complex and expensive logic. One key advantage of an MCU system is the opportunity to use software to replace complex and expensive hardware components. The cost of the initial software development is more than offset by the continued savings in hardware cost and reduced board space.
Typical Microcontroller Application Examples:
Telephones Answering Machines Pagers Motor Control · Appliances · Factory Automation · Mouse
Keyboards · Stereos · Televisions · Remote Controls · Toys · Smartcards · Multiplexed Systems
Anti-lock Braking Systems
Message Data Link Controller (J1850 Multiplex)
Some properties of the mdlc module:
SAE Standard J1850 Class B Data Communication Network Interface (J1850)
The J1850 protocol encompasses the lowest two layers of the International Standards Organization (ISO) open system interconnect (OSI) model, the data link layer and the physical layer. It is a multi-master system, utilizing the concept of carrier sense multiple access with collision resolution (CSMA/CR), whereby any node can transmit if it has determined the bus to be free. Non-destructive arbitration is performed on a bit-by-bit basis whenever multiple nodes begin to transmit simultaneously. J1850 allows for the use of a single or dual wire bus, two data rates (10.4 kbps or 41.7 kbps), and two bit encoding techniques (pulse width modulation (PWM) or variable pulse width modulation (VPW)).
A J1850 message, or frame, consists of a start of frame (SOF) delimiter, a one- or three-byte header, zero to eight data bytes, a cyclical redundancy check (CRC) byte, an end of data (EOD) delimiter, and an optional in-frame response, followed by an end of frame (EOF) delimiter. Frames using a single byte header are transmitted at 10.4 kbps, using VPW modulation, and contain a CRC byte for error detection. Frames using a one-byte consolidated header or a three-byte consolidated header can be transmitted at either 41.7 kbps or 10.4 kbps, using either PWM or VPW modulation techniques, and also contain a CRC byte for error detection.
Each frame can contain up to 12 bytes (VPW) or 101 bit times (PWM), with each byte transmitted MSB first. The optional in-frame response can contain either a single byte or multiple bytes, with or without a CRC byte. The requirements of each individual network determine which features are used.
Multi Function Timer
In both of these cases, there are redundant commands, making the plot data file larger than necessary.
RS-274D allows you to omit this redundant data. This example shows a box being drawn with four corners.
Non Modal Data
this example, a large amount of data has not been written, thus reducing
the final data file size.