MEMORY PARTITIONS

5.6.3Example 3: Using 1-Mbyte Mode

Figure 5-11 shows a system designed for operation in the 1-Mbyte mode. In this mode, code can execute from any page in the 1-Mbyte memory space. The system uses both 8-bit and 16-bit buses and uses the write-strobe mode. (See Chapter 13, “Interfacing with External Me mory.”)

The 32K×8 RAM stores near data in the upper half of page 00H. The 32K×16 RAM stores far data in page 01H. Using the WRL# and WRH# signals makes this RAM both byte- and word- accessible. The 128K×16 flash memory stores code and far constants in pages FCH, FDH, FEH, and FFH. With the write-signals connected as shown, the flash memory is word-accessible only. Table 5-14 lists the memory addresses. (For memory map details, see Table 5-3 on page 5-6.)

83C196NP only. The code and data in FF2000–FF2FFFH are implemented by int ernal ROM. Remapping this area into page 00H by setting the REMAP bit (CCB1.2) makes the far constants in FF2000–FF2FFFH of ROM accessible as near constants. An access to this address range is di- rected to external memory if EA# is low and to internal ROM if EA# is high.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CS2#

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CS1#

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CS0#

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CE#

 

 

 

CE#

 

 

CE#

 

 

 

 

 

Pages FC–FFH

 

 

Page 00H

 

 

Page 01H

 

 

A17:0

A17:1

A16:0

 

 

 

A14:0

A14:0

 

 

 

A15:1

A14:0

 

 

 

 

 

 

 

RAM

 

 

 

 

 

 

 

Flash

 

 

 

 

 

RAM

 

 

8XC196NP,

 

 

 

128Kx16

 

 

 

32Kx8

 

 

32Kx16

 

 

 

 

Code & Data

 

 

 

Data

 

 

Data

 

 

NU

 

 

 

FC0000

 

 

 

008000–

 

 

010000–

 

 

 

 

AD15:0

 

FFFFFFH

AD7:0

 

00FFFFH

AD15:0

 

01FFFFH

 

 

AD15:0

D15:0

 

 

 

D7:0

 

 

 

D15:0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OE#

 

WE#

 

OE#

 

WE#

 

OE# WRH# WRL#

 

 

RD#

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WRH#

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WRL#

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A2476-03

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 5-11. Example System Using the 1-Mbyte Mode

Notice that the microcontroller’s A1 line connects to a word-wide memory device’s A0 line. For a byte-wide memory, the microcontroller’s A0 line selects the byte to be read. For a word-wide memory, the microcontroller reads an entire word, then selects the required byte internally.

5-31

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Page 104
Image 104
Intel Microcontroller, 80C196NU, 8XC196NP manual Example 3 Using 1-Mbyte Mode, 01FFFFH, Oe# We# Oe# Wrh# Wrl# Rd#
Page 103 Page 105

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.
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