5V

 

 

 

 

R12

 

 

 

 

10K

R26 1K

 

 

 

 

TOP

 

 

 

 

 

 

R27 1K

6

BOT

 

 

 

7

 

 

 

8

 

 

 

 

 

 

R38

N/P

9

PWM1

 

10

 

 

 

11

 

 

 

 

Comp -

 

 

 

12

 

 

 

13

 

 

 

 

 

 

 

 

3

 

 

 

 

4

Zero Detect

 

 

 

5

 

 

 

 

 

 

5V

 

 

 

 

R29

 

 

 

R30 13K

11K

 

 

 

 

 

 

 

 

 

2

GND

 

 

R31

C9

 

 

 

 

 

3K9

1

100nF

 

 

 

 

 

 

GND

GND

 

 

 

5V

 

 

 

 

 

 

 

 

5V

 

 

 

 

 

D11

R28

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LED

1K8

 

 

 

IC2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14

 

 

 

 

PTB0/TOP

 

 

PTA0/ADC0/KBI0

 

 

 

 

 

15

 

 

 

 

PTB1/BOT

 

 

PTA1/ADC1/KBI1

 

 

 

 

 

 

16

 

 

 

 

PTB2/FAULT

 

 

PTA2/ADC2/KBI2

 

 

 

 

 

 

17

 

 

 

 

PTB3/PWM0

 

 

PTA3/ADC3/KBI3

 

 

 

 

 

 

18

 

 

 

 

PTB4/PWM1

 

 

PTA4/ADC4/KBI4

 

 

 

 

 

 

19

 

 

 

 

PTB5/V+

 

 

PTA5/RST/KBI5

 

 

 

 

 

 

20

 

 

 

 

PTB6/V-

PTA6/ADC5/TCH0/KBI6

 

 

 

 

 

 

 

 

 

PTB7/VOUT/ADC6/FAULT

 

 

 

 

 

 

 

 

 

 

PTC0/OSC1

 

 

 

 

VDD

1

 

 

 

 

 

 

 

 

2

 

2

 

PTC1/OSC2

 

 

 

 

VSS

 

 

PTC2/SHTDWN/IRQ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MC68HC908LB8-CASE_751D

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

5V

JP5

1

2

3

4

Serial Data5 6

CONN/HDR/6X1

GND

R260

0R

C19

 

100nF

25V

 

2

 

 

C29

 

 

 

 

 

 

 

 

 

 

 

1

 

 

150nF

 

 

 

 

 

 

 

 

 

GND

 

 

R39

0R

R33

10K

Serial Data

DCB Divider

Tube Current 1

Tube Current 2

Tube Voltage difference

5V

JP2

1

2

3

Luminance Level

GND

Figure A-5. Microcontroller for discontinuous conduction mode HW variation

Page 64
Image 64
Freescale Semiconductor M68HC08 manual Top

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.