Freescale Semiconductor M68HC08 manual Flow Chart Main Flow, Part

Page 47

RESET

 

 

 

 

 

 

 

 

 

 

 

 

 

Set PWM0 (PTB3), set PWM1 (PTB4), Vout (PTB7)

 

 

and fault diode (PTA5) pins as outputs and set

 

setup

them to log. 1

 

 

 

 

 

 

applicationand

 

 

 

 

 

 

Set configuration registers CONFIG1, CONFIG2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Set IRQ register (INTSCR): falling edge,

 

Microcontroller

enable IRQ interrupt request

 

 

 

 

 

 

 

 

 

 

 

Wait for a moment to stabilize internal oscillator

Disable all interrupts

Set PWM :

-reset sine tab. pointer

-PMOD = PWM_MODULUS

-PVAL0 = 0, PVAL1 = 0;

-PCTL2 - reload cycles PWM prescaler, negative polarity, disable PWM1, enable PWM0

-DISMAP - disable PWM1 if ext.fault occurs

//result 0000 0010=0x02

-FCR - disable fault interrupt, set manual or automatic fault mode according HW variation

-PCTL1 - set fault pin bit, enable PWM int.,clear

PWM reload flag, clear LDOK, enable PWM module

Set HRP :

-HRPCTRL - disable HRP

-HRPDCR - set dual freq. generator as a clock for HRP and set divide ratio

-HRPTBH,HRPTBL- set time base

-HRPPER - set maximum ballast frequency

-HRPDT- set deadtime

-HRPCTRL - disable SHTDWN pin

disable SHTDWN interrupt enable TOP,BOT pins set HRP frequency mode

Set ADC clock prescaler

Set nr. of attemps (currFltCNT) when

zero current fault appears during run mode

Set nr. of attemps (ignitFltCNT) when

ignition is unsuccesful

Detailed Software Description

Disable PI PFC stage regulator calculation

Enable all interrupts

Set values of PI PFC stage regulator for start PFC :

-integralPortionK_1 = 0;

-sineGain = 0;

Set values of PI ballast stage regulator :

-proportionalGainI = PI_KP_RUNI;

-integralGainI = PI_KI_RUNI;

-integralPortionK_1I = 0;

Reset DC-BUS voltage variable

Enable comparator module and powered on

1

Reset current values

Set value of PI PFC stage regulator for start PFC : - integralPortionK_1 = 0;

Set values of PI PFC stage regulator for start PFC :

-proportionalGain = PI_KP_START;

-integralGain = PI_KI_START;

Measure DC-BUS voltage

Enable PI PFC stage regulator calculation

Microcontroller and

application setup

2

Figure 5-7. Flow Chart — Main Flow, Part 1

Dimmable Light Ballast with Power Factor Correction, Rev. 1

Freescale Semiconductor

47

Page 46 Page 48
Image 47
Page 46 Page 48
Contents Dimmable Light Ballast with Power Factor Correction Page Designer Reference Manual Dimmable Light Ballast with Power Factor CorrectionDraft 2 for Review Chapter Hardware Design Contents Chapter IntroductionChapter Control Theory Chapter Reference DesignAppendix B. References Chapter Demo SetupAppendix A. Schematics and Part List Chapter Software DesignIntroduction Benefits of this SolutionMC68HC908LB8 Microcontroller MC68HC908LB8 Microcontroller Freescale Semiconductor Fluorescent Lamp Operation Fluorescent Lamp Control TheoryTypical Low Pressure Fluorescent Tube I/V Characteristic Typical Fluorescent Tube Equivalent Circuit in Steady State Controlling the Fluorescent LampControl Theory PFC Control Theory Main Characteristics of the Dual Switch TopologiesDigital Power Factor Concept Hysteresis Current Control Mode Hysteresis Current Control Mode Current Waveform Digital Power Factor Concept Discontinuous Conduction ModeDiscontinuous Conduction Mode Principle Generated Input Current Waveform Concept SummaryFreescale Semiconductor Application Outline Dimmable Light Ballast CharacteristicsApplication Description Light Ballast CharacteristicsLight Ballast Control Power Factor CorrectionSoftware Specification Software SpecificationHardware Specification Protection FeaturesSystem Modules Hardware ImplementationInput and PFC Dimmable Light Ballast Input and PFC Inverter Dimmable Light Ballast Inverter Microcontroller J1 Luminance Header Dimmable Light Ballast MicrocontrollerJ2 Interface Header Supplied Voltages Power SupplyFreescale Semiconductor Control Algorithm Description Chapter Software DesignDC-bus Voltage Control Power Factor Correction ControlTube Start Mode Roundi tmin ⋅ AD max ⁄ i max Software Implementation Initialization SetupPWM Setup PWM Frequency = BusFrequency Hz Hz Main Program Loop Sine Wave Generation Interrupt Routine Synchronization Interrupt RoutineFlow Chart Sine Wave Generation Interrupt Routine Fault Detection and Processing Detailed Software Description Flow Chart timovISR and faultISRFlow Chart Main Flow, Part Reference sine gain Yes Is preheat frequency reached? Has 1ms gone? 10. Flow Chart Main Flow, Part Memory Usage Microcontroller UsageMicrocontroller Peripheral Usage Program and Data Memory UsageI/O Usage Definitions of Constants and Variables3 I/O Usage System Setup Definitions Represents the number of fault states during tube ignition Defines the minimum HRP frequency in kHz during run modeDefines the maximum HRP frequency in kHz during run mode Represents the number of fault states during run modeExtern tSWFLAGS Swflags System Constants and VariablesExtern tU08 CurrT1 Building and Uploading the Application Hardware SetupSoftware Setup Required Software Tools\Sources\main.c, main program Executing the ApplicationProject Files \prm\P&EFCSlinker.prm, linker program fileSchematics Appendix A. Schematics and Part List7mH 7mH Figure A-3. Inverter TOP BOT TOP Figure A-6. Power supply Table A-1. Printed Circuit Board Parts List Parts ListInternational IRF830A Dimmable Light Ballast with Power Factor Correction, Rev Appendix B. References Dimmable Light Ballast with Power Factor Correction, Rev Page How to Reach Us
Related manuals
Manual 30 pages 41.27 Kb

M68HC08 specifications

Freescale Semiconductor, known for its innovative solutions in the field of embedded systems, developed the M68HC08 microcontroller family, which includes the MC68HC908QT2. This 8-bit microcontroller is engineered to meet the demands of diverse applications, including automotive, industrial, and consumer electronics.

The MC68HC908QT2 is designed around Freescale’s M68HC08 core, which is renowned for its efficient and reliable performance. This microcontroller integrates a powerful instruction set, enabling developers to create high-performance applications with relatively low power consumption. The device operates at a clock frequency of up to 3 MHz, which is adequate for various control tasks.

One of the key features of the MC68HC908QT2 is its memory architecture. It includes a 2 KB Flash memory for program storage, representing a significant advantage for developers requiring non-volatile memory. Additionally, it encompasses 128 bytes of EEPROM memory, allowing for data retention even after power loss. The microcontroller also has 256 bytes of RAM for efficient data manipulation during operation.

In terms of input/output capabilities, the MC68HC908QT2 supports a variety of interfacing options. The microcontroller features up to 20 general-purpose I/O pins for flexibility in connecting with peripheral devices. Additionally, it provides multiple analog-to-digital converters (ADC) and timers that facilitate efficient analog signal processing and precise control through timing functions.

The architecture of the MC68HC908QT2 also incorporates sophisticated on-chip peripherals, enhancing its functionality. These peripherals include PWM (Pulse Width Modulation) outputs, which are essential for applications requiring motor control and other precise duty cycle processes. The integrated watchdog timer ensures reliable operation by resetting the system in the event of an application failure.

Moreover, the MC68HC908QT2 is equipped with an efficient power management system, enabling operation in a low-power mode, ideal for battery-powered applications. This microcontroller is packaged in a compact 28-pin dual in-line package (DIP), making it suitable for space-constrained designs.

In summary, the Freescale Semiconductor MC68HC908QT2 microcontroller is distinguished by its robust performance, extensive memory options, and versatile I/O capabilities. Its advanced features, including built-in timers, ADC, and a power management system, make it an exceptional choice for developers seeking to implement reliable and efficient embedded solutions. With its comprehensive architecture, the MC68HC908QT2 remains a popular choice in the landscape of 8-bit microcontrollers.
Top Page Image Contents