INTEL 186 EB/EC EVALUATION BOARD USER’S MANUAL

6.2RISM STRUCTURE

The RISM resides in the target system and provides the interface between the target system and the user interface, which resides in the host system. The RISM is compact and simple. This serves two purposes:

1.The RISM can reside in a user’s system with minimal impact on available memory.

2.The RISM is easy to port into the target’s environment.

The internal state structure of the RISM was kept as simple as possible. There are only three internal flags that can change the way that the RISM deals with a character sent by the host.

6.3RECEIVING DATA FROM THE HOST

When the RISM receives a character from the host, its first task is to determine whether the character represents a command or data. When the character is less than 32 (decimal), it is assumed to be a command. When the character is more than 32 (decimal), it is assumed to be data. When the host needs to send a data byte that has a value less than 32, it first must issue a SET_DATA_FLAG command. When the DATA_FLAG is set, the next character received by the RISM is interpreted as data (even if it is less than 32), and the DATA_FLAG is cleared. Once the RISM determines that the received character is a data byte, it processes it by shifting the 32-bit RISM_DATA register left eight places and then placing the data byte in the lower byte of the RISM_DATA register. The data shifted out of the upper byte of the RISM_DATA register is discarded.

6.4SENDING DATA TO THE HOST

When the host expects data to be returned from the RISM, it sends a TRANSMIT command byte and waits for a response. The RISM transmits the lower byte of the 32-bit RISM_DATA register and right shifts the RISM_DATA register by eight bits. As part of this command, the RISM increments its RISM_ADDR register. The RISM transmits data only in response to a TRANSMIT command, never on its own initiative or even in response to other commands from the host.

6.5RISM COMMANDS

This section details the operation of each of the commands sent to the RISM.

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Intel 80L188EC, 80L186EB, 80L186EC Rism Structure, Receiving Data from the Host, Sending Data to the Host, Rism Commands
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80L188EB, 80C188EC, 80C188EB, 80L186EB, 80C186EB specifications

The Intel 80L188EC, 80C186EC, 80L186EC, 80C186EB, and 80L186EB microprocessors represent a significant evolution in Intel's 16-bit architecture, serving various applications in embedded systems and computing during the late 1980s and early 1990s. These microprocessors are designed to offer a blend of performance, efficiency, and versatility, making them suitable for a range of environments, including industrial control, telecommunications, and personal computing.

The Intel 80L188EC is a member of the 186 family, notable for its low-power consumption and integrated support for a range of peripheral devices. It operates at clock speeds of up to 10 MHz and features a 16-bit architecture, providing a balance of processing power and energy efficiency. The 80C186EC, on the other hand, is a more advanced version, offering enhanced performance metrics with faster clock speeds and improved processing capabilities, making it ideal for applications that require more computational power.

The 80L186EC shares similarities with the 80L188EC but is enhanced further for various low-power applications, especially where battery life is crucial. With a maximum clock speed of 16 MHz, it excels in scenarios demanding energy-efficient processing without sacrificing performance.

In contrast, the 80C186EB and 80L186EB are optimized versions that bring additional features to the table. The 80C186EB operates at higher clock speeds, coupled with an extended instruction set, enabling it to handle more complex tasks and run sophisticated software. These enhancements allow it to serve well in environments that require reliable performance under load, such as data acquisition systems or advanced control systems.

The 80L186EB is tailored for specific low-power scenarios, integrating Intel's sophisticated low-power technologies without compromising on speed. Utilizing advanced process technologies, these chips benefit from reduced heat output and extended operating life, a significant advantage in embedded applications.

Overall, these microprocessors showcase Intel's commitment to innovation in 16-bit processing, marked by their varying capabilities and power profiles tailored to meet the demands of diverse applications, from industrial systems to consumer electronics. Their legacy continues to influence subsequent generations of microprocessor designs, emphasizing performance, energy efficiency, and versatile applications in computing technology. As such, the Intel 80C186 and 80L188 families play a crucial role in understanding the evolution of microprocessor technology.
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