84MC68340 USER’S Manualmotorola | Motorola instruction

Freescale Semiconductor, Inc.

Command Sequence:

???

NORMAL

MODE

XXX	NEXT CMD
"ILLEGAL"	"NOT READY"

Freescale Semiconductor, Inc...

Operand Data:

None

Result Data:

None

5.6.2.8.13Call User Code (CALL). This instruction provides a convenient way to patch user code. The return PC is stacked at the location pointed to by the current SP. The stacked PC serves as a return address to be restored by the RTS command that terminates the patch routine. After stacking is complete, the 32-bit operand data is loaded into the PC. The pipeline is flushed and refilled from the location pointed to by the new PC, BDM is exited, and normal mode instruction execution begins.

NOTE

If a bus error or address error occurs during return address stacking, the CPU returns an error status via the serial interface and remains in BDM.

If a bus error or address error occurs on the first instruction prefetch from the new PC, the processor exits BDM and the error is trapped as a normal mode exception. The stacked value of the current PC may not be valid in this case, depending on the state of the machine prior to entering BDM. For address error, the PC does not reflect the true return PC. Instead, the stacked fault address is the (odd) return PC.

Command Format:

15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	0

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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 manual 84MC68340 USER’S Manualmotorola

Models: MC68340

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc...

5- 84MC68340 USER’S MANUALMOTOROLA

MC68340 specifications