CGM Acquisition/Lock Time Specifications

19.12 CGM Acquisition/Lock Time Specifications

Description

Symbol

Min

Typ

Max

Notes

 

 

 

 

 

 

Filter capacitor multiply factor

CFACT

—

0.0154

—

F/sV

Acquisition mode time factor

KACQ

—

0.1135

—

V

Tracking mode time factor

KTRK

—

0.0174

—

V

Manual mode time to stable

tACQ

—

(8*VDDA)/

—

If CF chosen

(fXCLK*KACQ)

correctly

 

 

 

 

Manual stable to lock time

tAL

—

(4*VDDA)/

—

If CF chosen

(fXCLK*KTRK)

correctly

 

 

 

 

Manual acquisition time

tLock

—

tACQ+tAL

—

 

Tracking mode entry frequency

∆TRK

0

—

± 3.6%

 

tolerance

 

 

 

 

 

 

 

 

 

 

 

 

Acquisition mode entry frequency

∆

±

—

± 7.2%

 

tolerance

ACQ

6.3%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Lock entry frequency tolerance

∆Lock

0

—

± 0.9%

 

Lock exit frequency tolerance

∆

±

—

± 1.8%

 

 

UNL

0.9%

 

 

 

Reference cycles per acquisition mode

nACQ

—

32

—

 

measurement

 

 

 

 

 

 

 

 

 

 

 

 

Reference cycles per tracking mode

nTRK

—

128

—

 

measurement

 

 

 

 

 

 

 

 

 

 

 

 

Automatic mode time to stable

tACQ

nACQ/fXCLK

(8*VDDA)/

—

If CF chosen

(fXCLK*KACQ)

correctly

 

 

 

 

Automatic stable to lock time

tAL

nTRK/fXCLK

(4*VDDA)/

—

If CF chosen

(fXCLK*KTRK)

correctly

 

 

 

 

Automatic lock time

tLock

—

tACQ+tAL

—

 

PLL jitter (deviation of average bus

fJ

0

—

± (fXCLK)

N = VCO

frequency over 2 ms)

*(0.025%)

freq. mult.

 

 

 

*(N/4)

 

 

 

 

 

 

 

 

 

 

 

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

Freescale Semiconductor

273

Page 272 Page 274
Page 273
Image 273
Freescale Semiconductor MC68HC908MR16 manual CGM Acquisition/Lock Time Specifications, Description Symbol Min Typ Max
Page 272 Page 274

MC68HC908MR16, MC68HC908MR32 specifications

Freescale Semiconductor's MC68HC908MR32 and MC68HC908MR16 microcontrollers are part of the popular HC08 family, designed primarily for embedded applications. These microcontrollers are particularly favored in automotive, industrial, and consumer product sectors due to their reliability and versatility.

One of the standout features of the MC68HC908MR series is its CMOS technology, which enhances performance while minimizing power consumption. This makes these microcontrollers suitable for battery-operated devices. They operate at a maximum clock frequency of 2 MHz and offer a 16-bit architecture, providing a solid balance between processing power and efficiency.

The MC68HC908MR32 variant is equipped with 32KB of flash memory, which allows for the storage of complex programs and extensive data handling. In contrast, the MC68HC908MR16 features 16KB of flash memory, making it ideal for simpler applications. Both microcontrollers also come with 1KB of RAM, enabling efficient data processing and real-time operations.

Another significant characteristic of these microcontrollers is their integrated peripherals. They come with multiple input/output (I/O) pins, which allow for connectivity with various sensors and actuators. The built-in timer systems offer precise timing control for automotive and industrial applications, while the Analog-to-Digital Converter (ADC) provides essential conversion capabilities for various analog signals.

For communication purposes, the MC68HC908MR series includes a serial communication interface, enabling easy integration with other devices and systems. This versatility facilitates the development of complex systems that require interaction with external components.

Security is another crucial aspect of these microcontrollers. They have built-in fail-safe mechanisms to ensure reliable operation under various conditions, making them suitable for critical systems. Additionally, their robust architecture helps to safeguard against potential disruptions or attacks.

In summary, Freescale Semiconductor's MC68HC908MR32 and MC68HC908MR16 microcontrollers are key players in the embedded systems landscape. Their blend of power efficiency, integrated features, and scalability ensures they remain relevant for a wide array of applications, making them a favored choice among engineers and developers looking for dependable solutions in a competitive market.
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