Serial I/O SIO Port Functional Overview | Intel 80C196NU, 8XC196NP

CHAPTER 8 SERIAL I/O (SIO) PORT

A serial input/output (SIO) port provides a means for the system to communicate with external devices. This device has a serial I/O (SIO) port that shares pins with port 2. This chapter describes the SIO port and explains how to configure it. Chapter 7, “I/O Ports,” explains how to configure the port pins for their special functions. Refer to Appendix B for details about the signals dis- cussed in this chapter.

8.1SERIAL I/O (SIO) PORT FUNCTIONAL OVERVIEW

The serial I/O port (Figure 8-1) is an asynchronous/synchronous port that includes a universal asynchronous receiver and transmitter (UART). The UART has one synchronous mode (mode 0) and three asynchronous modes (modes 1, 2, and 3) for both transmission and reception.

Interrupts

Internal

Data

Bus

SBUF_RX

SBUF_TX

Control Logic

Internal

Clock

Signal

Receive Shift Register

Transmit Shift Register

T1CLK 0

Prescale

(÷2)1

RXD

TXD

Baud Rate

Generator


SP_STATUS		SP_CON

SP_CON.6MSB

SP_BAUD

Note: The prescale circuitry is unique to the 80C196NU.

A3070-02

Figure 8-1. SIO Block Diagram

The serial port receives data into the receive buffer; it transmits data from the port through the transmit buffer. The transmit and receive buffers are separate registers, permitting simultaneous reads and writes to both. The transmitter and receiver are buffered to support continuous trans- missions and to allow reception of a second byte before the first byte has been read.

8-1

Microcontroller, 80C196NU, 8XC196NP specifications

The Intel 8XC196NP and 80C196NU microcontrollers are part of Intel's renowned 16-bit microcontroller series that gained popularity in the 1980s and 1990s for embedded systems applications. Designed for a variety of applications, these microcontrollers are characterized by their robust performance, versatility, and industry-standard architecture.

The 8XC196NP features an enhanced instruction set with over 100 instructions, allowing for efficient code execution. It operates at clock speeds up to 16 MHz, which contributes to improved performance in time-sensitive applications. The microcontroller is equipped with a 16-bit data bus, enabling more efficient data handling compared to its 8-bit predecessors, thus accommodating complex algorithms and large data sets.

In terms of memory architecture, the 8XC196NP supports an addressable memory space of up to 64 KB of program memory and 64 KB of data memory. This configuration provides sufficient space for large applications while ensuring fast data access. The microcontroller includes integrated features such as timers, serial I/O capabilities, and interrupt processing, which enhance its functionality for real-time applications and control mechanisms.

The 80C196NU, on the other hand, is designed for lower power operation, making it suitable for battery-powered devices. This microcontroller maintains similar features to the 8XC196NP while offering advancements that support low-power consumption. The 80C196NU can also function in a range of temperature environments, making it adaptable for industrial applications.

Both the 8XC196NP and 80C196NU support external memory interfacing, allowing designers to expand the system's capability by connecting additional ROM and RAM. This flexibility makes them appealing for developing complex systems, such as motor controls, industrial automation, and consumer electronics.

Another standout feature of these microcontrollers is their built-in debugging capabilities. Intel provided hardware and software tools that enabled developers to test and troubleshoot their applications effectively, reducing the development time and increasing reliability.

Overall, the Intel 8XC196NP and 80C196NU microcontrollers stand out for their dependability, versatility, and performance, contributing significantly to the evolution of embedded system design. Their legacy continues to influence modern microcontroller technology, ensuring their relevance in a wide array of applications today.

Intel 80C196NU, 8XC196NP manual Serial I/O SIO Port Functional Overview, SIO Block Diagram

Models: Microcontroller 80C196NU 8XC196NP

CHAPTER 8