Motorola manual 11-6MC68340 USER’S Manualmotorola

Models: MC68340

1 441
Download 441 pages 2.45 Kb
Page 406
Image 406

Freescale Semiconductor, Inc...

Freescale Semiconductor, Inc.

11.6 AC ELECTRICAL SPECIFICATIONS CONTROL TIMING (See notes (a), (b),

(c), and (d) corresponding to part operation, GND = 0 Vdc, TA = 0 to 70°C; see numbered notes)

 

 

 

3.3 V

3.3 V or 5.0 V

5.0 V

 

 

 

 

8.39 MHz

16.78 MHz

25.16 MHz

 

Num.

Characteristic

Symbol

Min

Max

Min

Max

Min

Max

Unit

 

System Frequency1

fsys

dc

8.39

dc

16.78

dc

25.16

MHz

 

Crystal Frequency

fXTAL

25

50

25

50

25

50

kHz

 

On-Chip VCO System Frequency

fsys

0.13

8.39

0.13

16.78

0.13

25.16

MHz

 

On-Chip VCO Frequency Range

fVCO

0.1

16.78

0.1

33.5

0.1

50.3

MHz

 

External Clock Operation

fsys

0

8

0

16

0

25

MHz

 

PLL Start-up Time2

trc

20

20

20

ms

 

Limp Mode Clock Frequency 3

flimp

fsys /2

fsys /2

fsys /2

kHz

 

SYNCR X-bit = 0

 

 

 

SYNCR X-bit = 1

 

fsys

fsys

fsys

 

 

CLKOUT stability 4

ΔCLK

–1

+1

–1

+1

–1

+1

%

15

CLKOUT Period in Crystal Mode

tcyc

119.2

59.6

40

ns

1B6

External Clock Input Period

tEXTcyc

125

62.5

40

ns

1C 7

External Clock Input Period with PLL

tEXTcyc

125

62.5

40

ns

2,3 8

CLKOUT Pulse Width in Crystal Mode

tCW

56

28

19

ns

2B, 3B9 CLKOUT Pulse Width in External Mode

tEXTCW

56

28

18

ns

2C,

CLKOUT Pulse Width in External w/PLL

tEXTCW

62.5

31

20

ns

3C 10

Mode

 

 

 

 

 

 

 

 

4,5

CLKOUT Rise and Fall Times

tCrf

10

5

4

ns

NOTES:

(a)The electrical specifications in this document for both the 8.39 and 16.78 MHz @ 3.3 V ±0.3 V are preliminary and apply only to the appropriate MC68340V low voltage part.

(b)The 16.78-MHz specifications apply to the MC68340 @ 5.0 V ±5% operation.

(c)The 25.16 MHz @ 5.0 V ±5% electrical specifications are preliminary.

(d)For extended temperature parts T A = –40 to +85°C. These specifications are preliminary.

1.All internal registers retain data at 0 Hz.

2.Assumes that a stable VCCSYN is applied, that an external filter capacitor with a value of 0.1 F is attached to the XFC pin, and that the crystal oscillator is stable. Lock time is measured from power-up to RESET release. This specification also applies to the period required for PLL lock after changing the W and Y frequency control bits in the synthesizer control register (SYNCR) while the PLL is running, and to the period required for the clock to lock after LPSTOP.

3.Determined by the initial control voltage applied to the on-chip VCO. The X-bit in the SYNCR controls a divide- by-two scaler on the system clock output.

4.CLKOUT stability is the average deviation from programmed frequency measured at maximum f sys . Measurement is made with a stable external clock input applied using the PLL.

5.All crystal mode clock specifications are based on using a 32.768-kHz crystal for the input.

6.When using the external clock input mode (MODCK reset value = 0 V), the minimum allowable t EXTcyc period will be reduced when the duty cycle of the signal applied to EXTAL exceeds 5% tolerance. The relationship

between external clock input duty cycle and minimum t EXTcyc is expressed:

Minimum tEXTcyc period = minimum tEXTCW / (50% – external clock input duty cycle tolerance). Minimum external clock low and high times are based on a 45% duty cycle.

7.When using the external clock input mode with the PLL (MODCK reset value = 0 V), the external clock input duty cycle can be at minimum 20% to produce a CLKOUT with a 50% duty cycle.

8.For crystal mode operation, the minimum CLKOUT pulse width is based on a 47% duty cycle.

9.For external clock mode operation, the minimum CLKOUT pulse width is based on a 45% duty cycle, with a 50% duty cycle input clock.

11-6MC68340 USER’S MANUALMOTOROLA

For More Information On This Product,

Go to: www.freescale.com

Page 406
Image 406
Motorola manual 11-6MC68340 USER’S Manualmotorola

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.