MEMORY PARTITIONS

Table 5-5. Peripheral SFRs (Continued)

EPA, Timer 1, and Timer 2 SFRs (Continued)

Address

High (Odd) Byte

Low (Even) Byte

1F7EH

Reserved

Reserved

1F7CH

Reserved

Reserved

1F7AH

Reserved

Reserved

1F78H

Reserved

Reserved

1F76H

Reserved

Reserved

1F74H

Reserved

Reserved

1F72H

Reserved

Reserved

1F70H

Reserved

Reserved

Chip-select SFRs (Continued)

Address

High (Odd) Byte

Low (Even) Byte

1F4EH

Reserved

Reserved

1F4CH

Reserved

BUSCON1

1F4AH

ADDRMSK1 (H)

ADDRMSK1 (L)

1F48H

ADDRCOM1 (H)

ADDRCOM1 (L)

1F46H

Signature (H)††††

Signature (L)††††

1F44H

Reserved

BUSCON0

1F42H

ADDRMSK0 (H)

ADDRMSK0 (L)

1F40H

ADDRCOM0 (H)

ADDRCOM0 (L)

Must be addressed as a word.

††For the 8XC196NP, these are memory-mapped locations. They must be addressed with indirect or

indexed instructions, and they cannot be windowed.

†††The EPA_PEND register was called EPA_STAT in previous documentation for the 8XC196NP.

††††The 8XC196NP can be identified by its signature word, 80EFH, at locations 1F46–1F47H. The 8XC196NU has no signature word; locations 1F46–1F47H are reserved.

NOTE

Using any SFR as a base or index register for indirect or indexed operations can cause unpredictable results because external events can change the contents of SFRs. Also, because some SFRs are cleared when read, consider the implications of using an SFR as an operand in a read-modify-write instruction (e.g., XORB).

5.2.4Register File

The register file is divided into an upper register file and a lower register file (Figure 5-3). The upper register file consists of general-purpose register RAM. The lower register file contains ad- ditional general-purpose register RAM along with the stack pointer (SP) and the CPU special- function registers (SFRs).

5-9

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Intel 8XC196NP 1F7EH, 1F7CH, 1F7AH, 1F4EH, 1F4CH, BUSCON1, 1F4AH ADDRMSK1 H ADDRMSK1 L, ADDRCOM1 H ADDRCOM1 L, BUSCON0

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.