Motorola MC68340 manual

Freescale Semiconductor, Inc.

Command Sequence:

FILL (B/W)	MS DATA	LS DATA
???	"NOT READY"	"NOT READY"
	XXX	NEXT CMD
	"ILLEGAL"	"NOT READY"

WRITE

MEMORY

LOCATION

XXX

"NOT READY"

NEXT CMD

"CMD COMPLETE"

XXX	NEXT CMD
BERR/AERR	"NOT READY"

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FILL (LONG)	DATA	WRITE	XXX
		MEMORY
???	"NOT READY"		"NOT READY"
		LOCATION

	XXX	NEXT CMD	NEXT CMD
			"CMD COMPLETE"
	"ILLEGAL"	"NOT READY"

XXX	NEXT CMD
BERR/AERR	"NOT READY"

Operand Data:

A single operand is data to be written to the memory location. Byte data is transmitted as a 16-bit word, justified in the least significant byte; 16- and 32-bit operands are transmitted as 16 and 32 bits, respectively.

Result Data:

Status is returned as in the WRITE command: $0FFFF for a successful operation and $10001 for a bus or address error during write.

5.6.2.8.12Resume Execution (GO). The pipeline is flushed and refilled before normal instruction execution is resumed. Prefetching begins at the return PC and current privilege level. If either the PC or SR is altered during BDM, the updated value of these registers is used when prefetching commences.

NOTE

The processor exits BDM when a bus error or address error occurs on the first instruction prefetch from the new PC—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	1	0	0	0	0	0	0	0	0	0	0

MOTOROLAMC68340 USER’S MANUAL5- 83

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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 Write Memory Location XXX Not Ready Next CMD CMD Complete

Models: MC68340