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Motorola MC68340 manual Pin Function Signal Firq =, Pparb =

Models: MC68340

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Freescale Semiconductor, Inc...

Freescale Semiconductor, Inc.

4.2.5.2PORT B. Port B pins can be independently programmed to function as chip selects, IRQ≈ and MODCK pins, or discrete I/O pins. These pins are multiplexed as shown in Figure 4-7. Selection of a pin function is accomplished by a combination of the port B pin assignment register (PPARB) and the FIRQ bit of the MCR. See Table 4-5 for port B combinations. By changing the value of the FIRQ bit and the corresponding bits in the PPARB for a particular signal, the port B pins can be configured for different pin functions. Upon reset, port B is configured as MODCK, IRQ7, IRQ6, IRQ5, IRQ3, and CS3–CS0.

MODCK/PORT B0

IRQ7/PORT B7

IRQ6/PORT B6

INTERRUPT

IRQ5/PORT B5

PORT

IRQ3/PORT B3

LOGIC

IRQ4/PORT B4

IRQ2/PORT B2

IRQ1/PORT B1

CS3/IRQ4/PORT B4

AVEC

FULL IRQ

CS2/IRQ2/PORT B2

MUX

CS1/IRQ1/PORT B1

CS0/AVEC

CS3

CHIP-

CS2

SELECT

CS1

MODULE

CS0

FIRQ

Figure 4-7. Full Interrupt Request Multiplexer

Table 4-5. Port B Pin Assignment Register

		Pin Function
Signal	FIRQ = 0	FIRQ = 0	FIRQ = 1	FIRQ = 1
	PPARB = 0	PPARB = 1	PPARB = 0	PPARB = 1
IRQ7	PORTB7	IRQ7	PORTB7	IRQ7
IRQ6	PORTB6	IRQ6	PORTB6	IRQ6
IRQ5	PORTB5	IRQ5	PORTB5	IRQ5
IRQ3	PORTB3	IRQ3	PORTB3	IRQ3
CS3	CS3	CS3	PORTB4	IRQ4
CS2	CS2	CS2	PORTB2	IRQ2
CS1	CS1	CS1	PORTB1	IRQ1
CS0	CS0	CS0	AVEC	AVEC
MODCK	PORTB0	MODCK	PORTB0	MODCK

NOTE: MODCK has no function after reset.

4- 16MC68340 USER’S MANUALMOTOROLA

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Motorola MC68340 manual Pin Function Signal Firq =, Pparb =

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.