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Motorola MC68340 manual Address Mask $042, $04A, $052, $05A

Models: MC68340

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Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

NCS—No CPU Space

This bit specifies whether or not a chip select will assert on a CPU space access cycle (FC3–FC0 = $7 or $F). If both supervisor data and program accesses are desired, while ignoring CPU space accesses, then this bit should be set. The NCS bit is cleared at reset.

1 = Suppress the chip select on a CPU space access.

0 = Assert the chip select on a CPU space access.

V—Valid Bit

This bit indicates that the contents of its base address register and address mask register pair are valid. The programmed chip selects do not assert until the V-bit is set. A reset clears the V-bit in each base address register, but does not change any other bits in the base address and address mask registers (CS0 is a special case, see 4.2.4.2 Global Chip Select Operation).

1 = Contents are valid.

0 = Contents are not valid.

4.3.4.2ADDRESS MASK REGISTERS. There are four 32-bit address mask registers in the chip select function, one for each chip select signal.

Address Mask 1

 

 

 

 

 

 

 

 

$040, $048, $050, $058

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

AM31

AM30

AM29

AM28

AM27

AM26

AM25

AM24

AM23

AM22

AM21

AM20

AM19

AM18

AM17

AM16

RESET:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

U

U

U

U

U

U

U

U

U

U

U

U

U

U

U

U

 

 

 

 

 

 

 

 

 

 

 

 

 

Supervisor Only

Address Mask 2

 

 

 

 

 

 

 

 

$042, $04A, $052, $05A

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

AM15

AM14

AM13

AM12

AM11

AM10

AM9

AM8

FCM3

FCM2

FCM1

FCM0

DD1

DD0

PS1

PS0

RESET:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

U

U

U

U

U

U

U

U

U

U

U

U

U

U

U

U

U = Unaffected by reset

 

 

 

 

 

 

 

 

Supervisor Only

AM31–AM8—Address Mask Bits 31–8

The address mask field, the upper 24 bits of each address mask register, defines the chip select block size. The block size is equal to 2n , where n = (number of bits set in the address mask field) + 8.

Any set bit masks the corresponding base address register bit (the base address register bit becomes a don’t care). By masking the address bits independently, external devices of different size address ranges can be used. Address mask bits can be set or cleared in any order in the field, allowing a resource to reside in more than one area of the address map. This field can be read or written at any time.

MOTOROLAMC68340 USER’S MANUAL4- 31

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Motorola MC68340 manual Address Mask $042, $04A, $052, $05A
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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.