Ilr

Freescale Semiconductor, Inc.

Bits 11–8, 6–4—Reserved

SUPV—Supervisor/User

The value of this bit has no affect on registers permanently defined as supervisor only.

1 = The serial module registers, which are defined as supervisor or user, reside in supervisor data space and are only accessible from supervisor programs.

0 = The serial module registers, which are defined as supervisor or user, reside in user data space and are accessible from either supervisor or user programs.

IARB3–IARB0—Interrupt Arbitration Bits

Each module that generates interrupts has an IARB field. These bits are used to arbitrate for the bus in the case that two or more modules simultaneously generate an interrupt at the same priority level. No two modules can share the same IARB value. The reset value of the IARB field is $0, which prevents this module from arbitrating during the interrupt acknowledge cycle. The system software should initialize the IARB field to a value from $F (highest priority) to $1 (lowest priority).

7.4.1.2INTERRUPT LEVEL REGISTER (ILR). The ILR contains the priority level for the serial module interrupt request. When the serial module is enabled (i.e., the STP bit in the MCR is cleared), this register can be read or written to at any time while in supervisor mode.

ILR							$704
7	6	5	4	3	2	1	0
0	0	0	0	0	IL2	IL1	IL0
RESET:
0	0	0	0	0	0	0	0
Read/Write					Supervisor Only

Bits 7–3—Reserved

IL2–IL0—Interrupt Level Bits

Each module that can generate interrupts has an interrupt level field. The priority level encoded in these bits is sent to the CPU32 on the appropriate IRQ≈ signal. The CPU32 uses this value to determine servicing priority. The hardware reset value of $00 will not generate any interrupts. See Section 5 CPU32 for more information.

7.4.1.3INTERRUPT VECTOR REGISTER (IVR). The IVR contains the 8-bit vector number of the interrupt. When the serial module is enabled (i.e., the STP bit in the MCR is cleared), this register can be read or written to at any time while in supervisor mode.

MOTOROLAMC68340 USER’S MANUAL7- 21

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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 Ilr

Models: MC68340

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

MOTOROLAMC68340 USER’S MANUAL7- 21

MC68340 specifications