87C196CB SUPPLEMENT

Table 10-4. Serial Port Programming Mode Memory Map

Description

 

Address Range

 

 

Normal Operation

Serial Port Programming Mode

 

 

 

 

Internal OTPROM

FF2000–FF7FFFH

A000–FFFFH (bank 0; 1FF9H = 00H)

FF8000–FFFFFFH

8000–FFFFH (bank 1; 1FF9H = 80H)

 

 

 

 

External memory

—

4000–7FFFH

 

 

 

Do not address

—

2400–3FFFH

 

 

 

Test ROM and RISM

—

2000–23FFH

 

 

 

The lower 24 Kbytes of OTPROM (FF2000–FF7FFFH) are remapped to A000–FFFFH, and the upper 32 Kbytes (FF8000–FFFFFFH) are mapped to 8000–FFFFH. A bank switching mecha- nism differentiates between the two address ranges. The most-significant bit of an otherwise re- served byte register (location 1FF9H) selects the bank. Bank 0 is the lower 24 Kbytes, and bank 1 is the upper 32 Kbytes. To program the lower 24 Kbytes, you must write 00H to location 1FF9H. To program the upper 32 Kbytes, you must write 80H to location 1FF9H. (See page 10-4 for the required command sequences.)

WARNING

Writing any value other than 00H or 80H to location 1FF9H will cause the microcontroller to enter an unsupported test mode.

10.4.1 Selecting Bank 0 (FF2000–FF7FFFH)

Send the following RISM command sequence to select bank 0.

Code Description

1F DATA. High byte of address to DATA register.

F9 DATA. Low byte of address to DATA register.

0A DATA_TO_ADDR. Move address from DATA register to ADDR register.

00SET_DLE_FLAG. The next data byte is <1FH.

00DATA. Data to clear the most-significant bit.

07WRITE_BYTE. Move data from the DATA register to memory location 1FF9H.

10.4.2 Selecting Bank 1 (FF8000–FFFFFFH)

Send the following RISM command sequence to select bank 1.

Code Description

1F DATA. High byte of address to DATA register.

F9 DATA. Low byte of address to DATA register.

0A DATA_TO_ADDR. Move address from DATA register to ADDR register.

80 DATA. Data to set the most-significant bit.

07 WRITE_BYTE. Move data from the DATA register to memory location 1FF9H.

10-4

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Intel 8XC196NT Selecting Bank 0 FF2000-FF7FFFH, Selecting Bank 1 FF8000-FFFFFFH, Serial Port Programming Mode Memory Map
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8XC196NT, 87C196CB specifications

The Intel 87C196CB and 8XC196NT are microcontrollers from the C196 family, which was designed to meet the demands of embedded control technology. These microcontrollers are popular in various applications due to their robust architecture, extensive I/O capabilities, and specialized functionality, making them ideal for automotive, industrial, and communication systems.

The 87C196CB is distinguished by its 16-bit architecture, offering a balance of processing power and efficiency. It features a 16-bit data bus, which allows for fast data processing, and a 16-bit address bus, supporting up to 64KB of program memory. The microcontroller integrates on-chip memory, including 2KB of ROM and 128 bytes of RAM, which facilitates faster execution of programs and data handling.

One of the standout features of the 87C196CB is its versatility in I/O operations. It comes equipped with 32 general-purpose I/O lines that can be configured for various functions, including input, output, and interrupt handling. This flexibility enables developers to optimize the microcontroller for their specific application needs.

The 8XC196NT builds on the capabilities of its predecessor, offering advanced functionalities such as an enhanced instruction set and integrated peripherals. It includes additional features like timers, serial communication interfaces, and analog-to-digital converters, which expand its usability in complex embedded systems. The 8XC196NT supports multiple addressing modes, allowing for more efficient programming and memory management.

Both microcontrollers utilize innovative technologies that improve performance and power efficiency. The on-chip operating system support aids in real-time processing and multitasking, making them suitable for time-sensitive applications. Power management features are also incorporated, allowing these microcontrollers to operate in low-power modes, which is crucial for battery-operated devices.

The 87C196CB and 8XC196NT microcontrollers are characterized by their reliability and long service life, meeting the stringent demands of industrial applications. Their ability to perform tasks rapidly, combined with their diverse peripheral support, makes them popular choices among engineers and developers designing embedded systems. Overall, the Intel 87C196CB and 8XC196NT microcontrollers remain relevant in the rapidly evolving landscape of embedded technology, facilitating innovative solutions across various industries.
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