Swiv, Sypcr | Motorola MC68340 instruction

Freescale Semiconductor, Inc.

LOC—Loss of Clock Reset

1 = The last reset was caused by a loss of frequency reference to the clock synthesizer. This reset can only occur if the RSTEN bit in the SYNCR is set and the VCO is enabled.

SYS—System Reset

1 = The last reset was caused by the CPU32 executing a RESET instruction. The system reset does not load a reset vector or affect any internal CPU32 registers, SIM40 configuration registers, or the MCR in each internal peripheral module (DMA, timers, and serial modules). It will, however, reset external devices and all other registers in the peripheral modules.

4.3.2.4SOFTWARE INTERRUPT VECTOR REGISTER (SWIV). The SWIV contains the 8-bit vector that is returned by the SIM40 during an IACK cycle in response to an interrupt generated by the software watchdog. This register can be read or written at any time. This register is set to the uninitialized vector, $0F, at reset.

SWIV							$020
7	6	5	4	3	2	1	0
SWIV7	SWIV6	SWIV5	SWIV4	SWIV3	SWIV2	SWIV1	SWIV0
RESET:
0	0	0	0	1	1	1	1

Supervisor Only

4.3.2.5SYSTEM PROTECTION CONTROL REGISTER (SYPCR). The SYPCR controls the system monitors, the prescaler for the software watchdog, and the bus monitor timing. This register can be read at any time, but can be written only once after reset.

SYPCR							$021
7	6	5	4	3	2	1	0
SWE	SWRI	SWT1	SWT0	DBFE	BME	BMT1	BMT0
RESET:
0	0	0	0	0	0	0	0

Supervisor Only

SWE—Software Watchdog Enable

1 = Software watchdog is enabled.

0 = Software watchdog is disabled.

See 4.2.2.5 Software Watchdog for more information.

SWRI—Software Watchdog Reset/Interrupt Select

1 = Software watchdog causes a system reset.

0 = Software watchdog causes a level 7 interrupt to the CPU32.

4- 24MC68340 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 Swiv, Sypcr, See 4.2.2.5 Software Watchdog for more information

Models: MC68340

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

SWIV

SYPCR

See 4.2.2.5 Software Watchdog for more information.

MC68340 specifications