Rsr

Freescale Semiconductor, Inc.

value of $0 prevents arbitration and causes all SIM40 interrupts, including external interrupts, to be discarded as extraneous.

4.3.2.2AUTOVECTOR REGISTER (AVR). The AVR contains bits that correspond to external interrupt levels that require an autovector response. Setting a bit allows the SIM40 to assert an internal AVEC during the IACK cycle in response to the specified interrupt request level. This register can be read and written at any time.

AVR							$006
7	6	5	4	3	2	1	0
AV7	AV6	AV5	AV4	AV3	AV2	AV1	0
RESET:
0	0	0	0	0	0	0	0

Supervisor Only

NOTE:

The IARB field in the MCR must contain a value other than $0 for the SIM40 to autovector for external interrupts.

4.3.2.3RESET STATUS REGISTER (RSR). The RSR contains a bit for each reset source to the SIM40. A set bit indicates the last type of reset that occurred, and only one bit can be set in the register. The RSR is updated by the reset control logic when the SIM40 comes out of reset. This register can be read at any time; a write has no effect. For more information, see Section 3 Bus Operation.

RSR							$007
7	6	5	4	3	2	1	0
EXT	POW	SW	DBF	0	LOC	SYS	0

Supervisor Only

EXT—External Reset

1 = The last reset was caused by an external signal driving RESET.

POW—Power-Up Reset

1 = The last reset was caused by the power-up reset circuit.

SW—Software Watchdog Reset

1 = The last reset was caused by the software watchdog circuit.

DBF—Double Bus Fault Monitor Reset

1 = The last reset was caused by the double bus fault monitor.

Bits 3, 0—Reserved

MOTOROLAMC68340 USER’S MANUAL4- 23

For More Information On This Product,

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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 Rsr

Models: MC68340

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

MC68340 specifications