Register Field for Rsreg and Wsreg | Motorola MC68340 manual

Freescale Semiconductor, Inc...

Freescale Semiconductor, Inc.

Result Data:

Always returns 32 bits of data, regardless of the size of the register being read. If the register is less than 32 bits, the result is returned zero extended.

The system control register is specified by the register field (see Table 5-24).

Table 5-24. Register Field for RSREG and WSREG

System Register	Select Code
Return Program Counter (RPC)	0000
Current Instruction Program Counter (PCC)	0001
Status Register (SR)	1011
User Stack Pointer (USP)	1100
Supervisor Stack Pointer (SSP)	1101
Source Function Code Register (SFC)	1110
Destination Function Code Register (DFC)	1111
Temporary Register A (ATEMP)	1000
Fault Address Register (FAR)	1001
Vector Base Register (VBR)	1010

5.6.2.8.7Write System Register (WSREG). Operand data is written into the specified system control register. All registers that can be written in supervisor mode can be written in BDM. Several internal temporary registers are also accessible.

Command Format:

15	14	13	12	11	10	9	8	7	6	5	4	3	0
0	0	1	0	0	1	0	0	1	0	0	0		REGISTER
Command Sequence:
				WSREG		MS DATA			LS DATA		NEXT CMD
				???		"NOT READY"		"NOT READY"			"CMD COMPLETE"
						XXX			NEXT CMD
						"ILLEGAL"		"NOT READY"

Operand Data:

The data to be written into the register is always supplied as a 32-bit long word. If the register is less than 32 bits, the least significant word is used.

Result Data:

“Command complete” status is returned when register write is complete.

5- 78MC68340 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 Register Field for Rsreg and Wsreg, System Register Select Code

Models: MC68340

Freescale Semiconductor, Inc...

Freescale Semiconductor, Inc.

Table 5-24. Register Field for RSREG and WSREG

System Register

Select Code

MC68340 specifications