Pitr

Freescale Semiconductor, Inc.

PIV7–PIV0—Periodic Interrupt Vector Bits 7–0

These bits contain the value of the vector generated during an IACK cycle in response to an interrupt from the periodic timer. When the SIM40 responds to the IACK cycle, the periodic interrupt vector from the PICR is placed on the bus. This vector number is multiplied by four to form the vector offset, which is added to the vector base register to obtain the address of the vector.

4.3.2.7PERIODIC INTERRUPT TIMER REGISTER (PITR). The PITR contains control for prescaling the software watchdog and periodic timer as well as the count value for the periodic timer. This register can be read or written at any time. Bits 15–10 are not implemented and always return zero when read. A write does not affect these bits.

PITR															$024
15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	0	0	0	0	0	SWP	PTP	PITR7	PITR6	PITR5	PITR4	PITR3	PITR2	PITR1	PITR0
RESET:
0	0	0	0	0	0	MODCK	MODCK	0	0	0	0	0	0	0	0

Supervisor Only

Bits 15–10—Reserved

SWP—Software Watchdog Prescale

This bit controls the software watchdog clock source as shown in 4.3.2.5 System Protection Control Register (SYPCR).

1 = Software watchdog clock prescaled by a value of 512.

0 = Software watchdog clock not prescaled.

The SWP reset value is the inverse of the MODCK bit state on the rising edge of reset.

PTP—Periodic Timer Prescaler Control

This bit contains the prescaler control for the periodic timer.

1 = Periodic timer clock prescaled by a value of 512.

0 = Periodic timer clock not prescaled.

The PTP reset value is the inverse of the MODCK bit state on the rising edge of reset.

PITR7–PITR0—Periodic Interrupt Timer Register Bits 7–0

The remaining bits of the PITR contain the count value for the periodic timer. A zero value turns off the periodic timer.

MOTOROLAMC68340 USER’S MANUAL4- 27

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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 Pitr

Models: MC68340

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

MC68340 specifications