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Motorola manual 24MC68340 USER’S Manualmotorola

Models: MC68340

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Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

TO—Timeout Interrupt

1 = The counter has transitioned from $0001 to $0000, and the counter has rolled over. This bit does not affect the programmed IRQ≈ signal if the IE2 bit in the CR is cleared.

0 = This bit is cleared by the timer whenever the RESET signal is asserted on the IMB, regardless of the mode of operation. This bit may also be cleared by writing a one to it. Writing a zero to this bit does not alter its contents. This bit is not affected by disabling the timer (SWR = 0).

TG—Timer Gate Interrupt

1 = This bit is set whenever the CR TGE bit is set and the TGATE≈ signal transitions in the manner to which the particular mode of operation responds. Refer to 8.3 Operating Modes for more details. This bit does not affect the programmed IRQ≈ signal if the IE1 bit in the CR is cleared.

0 = This bit is cleared by the timer whenever the RESET signal is asserted on the IMB, regardless of the mode of operation. This bit may also be cleared by writing a one to it. Writing a zero to this bit does not alter its contents. This bit is not affected by disabling the timer (SWR = 0).

TC—Timer Compare Interrupt

1 = This bit is set when the counter transitions (off a clock/event falling edge) to the value in the COM. This bit does not affect the programmed IRQ≈ signal if the IE0 bit in the CR is cleared.

0 = This bit is cleared by the timer whenever the RESET signal is asserted on the IMB, regardless of the mode of operation. This bit may also be cleared by writing a one to it. Writing a zero to this bit does not alter its contents. This bit is not affected by disabling the timer (SWR = 0).

TGL— TGATE≈ Level

1 = The TGATE≈ signal is negated.

0 = The TGATE≈ signal is asserted.

ON—Counter Enabled

1 = This bit is set whenever the SWR and CPE bits are set in the CR. If the CR TGE bit is set, TGATE≈ must also be asserted (except in the input capture/output compare mode) since this signal then controls the enabling and disabling of the counter. If all these conditions are met, the counter is enabled and begins counting down.

0 = The counter is not enabled and does not begin counting down.

OUT—Output Level

1 = TOUTx is a logic one.

0 = TOUTx is a logic zero, or the pin is three-stated.

COM—Compare Bit

This bit is used to indicate when the counter output value is at or between the value in the COM and $0000 (timeout).

8- 24MC68340 USER’S MANUALMOTOROLA

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Motorola manual 24MC68340 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.