Motorola MC68340 instruction

Freescale Semiconductor, Inc...

Freescale Semiconductor, Inc.

The following value has been calculated for independent variable X:

31	16	15	0
NOT USED		0	0 0 0 0 0 0 0 1 0 1 1 1 1 0 1

Since X is an 8-bit value, the upper four bits are used as a table offset and the lower four bits are used as an interpolation fraction. The following results are obtained from the subroutine:

Table Entry Offset ⇒ Dx [4:7] = $B = 11

Interpolation Fraction ⇒ Dx [0:3] = $D = 13

Thus, Y is calculated as follows:

Y = 80 + (13 (64 – 80)) / 16 = 67

If the 8-bit value for X were used directly by the table instruction, interpolation would be incorrectly performed between entries 0 and 1. Data must be shifted to the left four places before use:

LSL.W #4, Dx

The new range for X is 0 ≤ X ≤ 4096; however, since a left shift fills the least significant digits of the word with zeros, the interpolation fraction can only have one of 16 values.

After the shift operation, Dx contains the following value:

31	16	15	0
NOT USED		0 0 0 0 1 0 1 1 1	1 0 1 0 0 0 0

Execution of the table instruction using the new value in Dx yields:

Table Entry Offset ⇒ Dx [8:15] = $0B = 11

Interpolation Fraction ⇒ Dx [0:7] = $D0 = 208

Thus, Y is calculated as follows:

Y = 80 + (208 (64 – 80)) / 256 = 67

5.3.4.4TABLE EXAMPLE 4: MAINTAINING PRECISION. In this example, three TBL operations are performed and the results are summed. The calculation is done once with the result of each TBL rounded before addition and once with only the final result rounded.

Assume that the result of the three interpolations are as follows (a ".'' indicates the binary radix point).

TBL # 1	0010	0000 . 0111
TBL# 2	0011	1111 . 0111
TBL # 3	0000	0001 . 0111

5- 34MC68340 USER’S MANUALMOTOROLA

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MC68340 specifications

The Motorola MC68340 is a highly integrated microprocessor that was introduced in the early 1990s. It belongs to the 68000 family of microprocessors and is designed to cater to the demands of embedded systems, particularly in telecommunications and networking applications. This chip represents a significant evolution in microprocessor technology by combining a microprocessor core with additional peripherals on a single chip, making it an attractive solution for engineers looking to design compact and efficient systems.

One of the key features of the MC68340 is its 32-bit architecture, which allows for significant processing power and data handling capabilities. This architecture enables the processor to handle larger data sizes and perform more complex calculations compared to its 16-bit predecessors. The MC68340 operates at clock speeds typically ranging from 16 MHz to 25 MHz. Its dual instruction pipeline enhances throughput, allowing for simultaneous instruction fetches and executions, which significantly boosts performance.

A notable characteristic of the MC68340 is the inclusion of integrated peripherals, which help reduce the overall component count in a system. Key integrated components include a memory management unit (MMU), a direct memory access (DMA) controller, and various communication interfaces such as serial ports. The memory management capabilities enhance the processor's ability to manage memory resources efficiently, enabling it to support multitasking environments commonly found in modern computing.

In terms of connectivity, the MC68340 features connections for both synchronous and asynchronous serial communication, making it well-suited for networking tasks. The processor supports a range of bus standards, including address and data buses, which facilitate seamless interaction with peripheral devices.

Another important aspect of the MC68340 is its flexibility. The processor supports multiple operating modes, including multiple CPU configurations and compatibility with the Motorola 68000 family, allowing for easier integration into existing systems.

Moreover, the MC68340 boasts low power consumption compared to many of its contemporaries, making it an excellent choice for battery-operated applications, enhancing its appeal in sectors like telecommunications, industrial control, and automotive systems. Its combination of performance, integration, versatility, and efficiency has secured the MC68340 a reputable position in the annals of embedded systems technology, proving to be a valuable asset for developers and engineers alike.

Motorola MC68340 manual Following value has been calculated for independent variable

Models: MC68340

Freescale Semiconductor, Inc...

Freescale Semiconductor, Inc.

The following value has been calculated for independent variable X:

MC68340 specifications