MS Addr

Freescale Semiconductor, Inc.

The system control register is specified by the register field (see Table 5-24). The FAR is a read-only register—any write to it is ignored.

5.6.2.8.8Read Memory Location (READ). Read the sized data at the memory location specified by the long-word address. Only absolute addressing is supported. The SFC register determines the address space accessed. Valid data sizes include byte, word, or long word.

Command Format:

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

Freescale Semiconductor, Inc.

Command Sequence:

READ (B/W)	MS ADDR	LS ADDR	READ
???	"NOT READY"	"NOT READY"	MEMORY
???	"NOT READY"	"NOT READY"	LOCATION
			LOCATION
	XXX	NEXT CMD
	"ILLEGAL"	"NOT READY"

READ (LONG)	MS ADDR	LS ADDR	READ
???	"NOT READY"	"NOT READY"	MEMORY
???	"NOT READY"	"NOT READY"	LOCATION
			LOCATION
	XXX	NEXT CMD
	"ILLEGAL"	"NOT READY"

XXX

"NOT READY"

NEXT CMD

RESULT

XXX	NEXT CMD
BERR/AERR	"NOT READY"

XXX

"NOT READY"

XXXNEXT CMD

MS RESULT	LS RESULT
XXX	NEXT CMD
BERR/AERR	"NOT READY"

Operand Data:

The single operand is the long-word address of the requested memory location.

Result Data:

The requested data is returned as either a word or long word. Byte data is returned in the least significant byte of a word result, with the upper byte cleared. Word results return 16 bits of significant data; long-word results return 32 bits.

A successful read operation returns data bit 16 cleared. If a bus or address error is encountered, the returned data is $10001.

5.6.2.8.9Write Memory Location (WRITE). Write the operand data to the memory location specified by the long-word address. The DFC register determines the address

MOTOROLAMC68340 USER’S MANUAL5- 79

For More Information On This Product,

Go to: www.freescale.com

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 MS Addr

Models: MC68340

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

MC68340 specifications