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Intel Microcontroller Specifying the PTS Count, Single Transfer, Block Transfer, PWM Toggle Mode

Models: Microcontroller 80C196NU 8XC196NP

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8XC196NP, 80C196NU USER’S MANUAL

The address of the first (lowest) PTSCB byte is stored in the PTS vector table in special-purpose memory (see “Special-purpose Memory” on page 5-6). Figure 6-9 shows the PTSCB for each PTS mode. Unused PTSCB bytes can be used as extra RAM.

NOTE

The PTSCB must be located in the internal register file. The location of the first byte of the PTSCB must be aligned on a quad-word boundary (an address evenly divisible by 8). Because the PTS uses nonextended addressing, it cannot operate across page boundaries. For example, PTSSRC cannot point to a location on page 05 while PTSDST points to page 00. In the 8XC196NP, all nonextended data accesses will operate from the page defined by EP_REG. For PTS routines, write 00H to EP_REG to select page 00H (see “Accessing Data” on page 5-23). The 80C196NU forces all nonextended data accesses to page 00H. You cannot use EP_REG to change pages.

PTSVECT

Single Transfer

Unused

Unused

PTSDST (H)

PTSDST (L)

PTSSRC (H)

PTSSRC (L)

PTSCON

PTSCOUNT

Block Transfer

Unused

PTSBLOCK

PTSDST (H)

PTSDST (L)

PTSSRC (H)

PTSSRC (L)

PTSCON

PTSCOUNT

PWM Toggle

Mode

PTSCONST2 (H)

PTSCONST2 (L)

PTSCONST1 (H)

PTSCONST1 (L)

PTSPTR1 (H)

PTSPTR1 (L)

PTSCON

Unused

PWM Remap

Mode

Unused

Unused

PTSCONST1 (H)

PTSCONST1 (L)

PTSPTR1 (H)

PTSPTR1 (L)

PTSCON

Unused

Figure 6-9. PTS Control Blocks

6.6.1Specifying the PTS Count

For single and block transfer routines, the first location of the PTSCB contains an 8-bit value called PTSCOUNT. This value defines the number of interrupts that will be serviced by the PTS routine. The PTS decrements PTSCOUNT after each PTS cycle. When PTSCOUNT reaches zero, hardware clears the corresponding PTSSEL bit and sets the PTSSRV bit (Figure 6-10), which re- quests an end-of-PTS interrupt. The end-of-PTS interrupt service routine should reinitialize the PTSCB, if required, and set the appropriate PTSSEL bit to re-enable PTS interrupt service.

6-18

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Intel Microcontroller, 80C196NU Specifying the PTS Count, Single Transfer, Block Transfer, PWM Toggle Mode, PWM Remap Mode
Page 124 Page 126

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.