Semiconductor | Motorola MC68340 guide

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3.2.3.5WORD OPERAND TO 16-BIT PORT, ALIGNED. The MC68340 drives the address bus with the desired address and the size pins to indicate a word operand.

WORD OPERAND

OP0

OP1

DATA BUS

D15

D8 D7

SIZ1

SIZ0

DSACK1

DSACK0

CYCLE 1

OP0

OP1

For a read operation, the slave responds by placing the data on bits 15–0 of the data bus and asserting DSACK1 to indicate a 16-bit port. When DSACK1 is asserted, the MC68340 reads the data on the data bus and terminates the cycle.

For a write operation, the MC68340 drives the word operand on bits 15–0 of the data bus. The slave device then reads the entire operand from bits 15–0 of the data bus and asserts DSACK1 to terminate the bus cycle.

3.2.3.6LONG-WORD OPERAND TO 8-BIT PORT, ALIGNED. The MC68340 drives the address bus with the desired address and the SIZx pins to indicate a long-word operand.

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LONG-WORD OPERAND

DATA BUS

CYCLE 1

CYCLE 2

CYCLE 3

CYCLE 4

OP0		OP1		OP2	OP3
31	23		15		7	0

D15	D8 D7		D0		SIZ1	SIZ0	A0	DSACK1	DSACK0
OP0		(OP1)			0	0	0	1	0
OP1		(OP1)			1	1	1	1	0
OP2		(OP3)			1	0	0	1	0
OP3		(OP3)			0	1	1	1	0

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For a read operation, shown in Figure 3-3, the slave responds by placing the most significant byte of the operand on bits 15–8 of the data bus and asserting DSACK0 to indicate an 8-bit port. The MC68340 reads the most significant byte of the operand (byte

0)from bits 15–8 and ignores bits 7–0. The MC68340 then decrements the transfer size counter, increments the address, initiates a new cycle, and reads byte 1 of the operand from bits 15–8 of the data bus. The MC68340 repeats the process of decrementing the transfer size counter, incrementing the address, initiating a new cycle, and reading a byte to transfer the remaining two bytes.

For a write operation, shown in Figure 3-4, the MC68340 drives the two most significant bytes of the operand on bits 15–0 of the data bus. The slave device then reads only the most significant byte of the operand (byte 0) from bits 15–8 of the data bus and asserts DSACK0 to indicate reception and an 8-bit port. The MC68340 then decrements the transfer size counter, increments the address, and writes byte 1 of the operand to bits 15–8 of the data bus. The MC68340 continues to decrement the transfer size counter, increment the address, and write a byte to transfer the remaining two bytes to the slave device.

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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.

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MC68340 specifications