INTEL 186 EB/EC EVALUATION BOARD USER’S MANUAL

 

 

 

 

Table 3-4.

P2 Serial Channel 0

 

P2 Connector

 

 

Pin

 

Host RS-232

Connection on

 

 

Nos.

 

Signal Name

Evaluation Board

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

(CF)

 

DCD Data Carrier Detect

Test Point 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

(BB)

 

RxD Receive Data

RxD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

(BA)

 

TxD Transmit Data

TxD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

(CD)

 

DTR Data Terminal Ready

Test Point 4

1 2

3

4

5

 

 

 

 

 

 

 

5

(AB)

 

SG Signal Ground

Digital Ground

 

 

 

 

 

 

 

 

 

 

6

7

8

9

 

6

(AB)

 

DSR Data Set Ready

Test Point 2

 

 

 

 

 

 

 

7

(CD)

 

RTS Request To Send

Test Point 3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

(BA)

 

CTS Clear To Send

CTS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9

(BB)

 

RI Ring Indicator

Test Point 5

 

 

 

 

 

 

 

 

 

 

The two serial connectors are connected to the Maxim MAX561, an EIA/TIA-562 Driver/Receiver. This device operates from a 3.3 volt VCC (or 5 volts, optionally). The EIA/TIA- 562 standard is a low voltage serial communications protocol. This protocol operates at ±3.7 volts. The 3.3 volt signals from the board are charge-pumped to ±6.6 volt levels internally, conforming to this standard. Signals from the serial connectors, P1 and P2, are translated to a 3.3 volt level. Output from this device is recognized by EIA/TIA-232-D receivers, and inputs can handle EIA/TIA-232-D levels without damaging the device. The MAX561 SHDN pin (pin 25) connects to port pin 1.0 on the 80x186 processor. When this pin is programmed to a logic 1, the Maxim device will go into shutdown mode, reducing current consumption to leakage. During initialization, port pin 1.0 is programmed to a logic 0 to enable communication with the host PC.

Serial communications on the evaluation board are controlled by the 80x186 processor on-chip serial ports. Serial Port 0 on the microprocessor handles PC communications via connector P1. Serial Port 1 is available for user applications via connector P2. The 80x186 processor supports synchronous serial communications as well as various modes of asynchronous communications. The time base for the host interface is a 6.0 MHz oscillator connected to BCLK0, the external serial clock input on the 80x186 processor. This allows the user to change the processor operating frequency without altering the baud rate.

NOTE

The BCLK0 input must be less than half the processor operating frequency (which is half the clock input frequency). Operating the processor below 12.288 MHz requires reprogramming the serial control unit on the 80x186 processor. The source code for the RISM monitor is provided on a floppy diskette included in your kit for this purpose.

Figure 3-5 on page 3-11 illustrates the adaptor cable needed if your PC has a 25-pin serial port connector.

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Intel 80L186EC, 80L188EC, 80L186EB, 80C186EB, 80C188EB, 80L188EB, 80C188EC, 80C186EC user manual P2 Serial Channel, Cts
Page 33 Page 35

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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