A FLASH MCU SOLUTION
68HC908MR8
8-bit Microcontroller
TARGET APPLICATIONS
• Appliance compressors
• Smart appliances
• Industrial compressors (HVAC)
• Variable speed pumps (well, gas)
• HVAC blowers and fans
• General purpose drives
• Exercise equipment
• Electric powered recreational vehicles
• Medical scanners/pumps
• Printers/scanners/fax
• Electric lawn equipment
• Throttle control
• Seat module control
• Uninterruptible power supplies
FEATURES
HIGH-PERFORMANCE 68HC08 CPU CORE
• 8 MHz bus operation at 5V operation for
125 nsec minimum instruction cycle time
• Efficient instruction set including multiply
and divide
• 16 flexible addressing modes including
stack relative with 16-bit stack pointer
• Fully static low-voltage, low-power design
with wait and stop modes
BENEFITS
• Object code compatible with the 68HC05
• Easy to learn and use architecture
• C optimized architecture provides compact
code
INTEGRATED SECOND GENERATION FLASH MEMORY
• In-application re-programmable
• Extremely fast programming, encoding
64 bytes in as fast as 2 msec
• FLASH programming across the 68HC08’s
full operating supply voltage with no extra
programming voltage
• 10K write/erase cycles minimum over
temperature
• Flexible block protection and security
• Cost-effective programming changes and
field software upgrades via in-application
programmability and re-programmability
• Reduces production programming costs
through ultra-fast programming
• Byte-writable for data as well as program
memory
• Protects code from unauthorized reading
and to guard against unintentional
erasing/writing of user-programmable
segments of code
The 68HC908MR8 improves design
capabilities for 3-phase, variable speed
motion control. Each device incorporates
the fault tolerant and flexible 6-channel,
12-bit Pulse Width Modulator, supporting
center and edge-aligned modes with
automatic dead-time insertion and
patented dead-time compensation
capability. The 68HC908MR8 is designed
to save money and space, and includes
powerful features like 8K of FLASH
memory, a 10-bit analog-to-digital
converter (ADC), an asynchronous serial
communications interface (SCI) and small
outline packages.
7-CHANNEL/
10-BIT ADC
10-BIT ANALOG-TO-DIGITAL CONVERTER
• 7 channels
• Single conversion in 17 µsec
• Provides single or continuous conversion
• Generates an interrupt when input signal
exceeds a software programmable limit
12-BIT PULSE WIDTH MODULATION FOR MOTOR CONTROL
• 3 complementary or 6 independent PWM
signals
• Programmable output polarity
• Edge- or center-aligned waveforms
• Automatic dead-time
generation/compensation
• 20 mA sink on all PWMMC pins
• Programmable fault detection
• Provides multiple motor or multi-phase
control capability
• Reduces system cost through integration of
digital/analog circuitry
• Drastically reduces system-noise and
improves efficiency of the drive without the
need for external current sensors with
patented dead-time compensation
• Allows direct drive of the opto-coupling
stage
• Guarantees immediate shutdown of the
PWM outputs ensuring motor and
consumer safety
CPU08
256/192
RAM
8K FLASH
4K ROM
MON
PORT A
7
CLOCK GENERATION MODULE WITH PLL
PORT C
TIMA
PORT B
IRQ
TIMB
7
2
SIM
• Programmable clock frequency in integer
multiples of external crystal reference
• Crystal reference of 1 MHz to 8 MHz
• External clock option with or without PLL
• Provides high performance using low-cost,
low-frequency reference crystals
• Reduces generated noise while still
providing high performance (up to 32 MHz
internal clock)
COP
SCI
FOUR PROGRAMMABLE 16-BIT TIMER CHANNELS
• 125 nsec resolution at 8 MHz bus
• External clock input pin
• Free-running counter or modulo up-counter
• Configurable for input capture, output
compare, or unbuffered PWM
• Pairing timer channels provides a buffered
PWM function
LVI
BRK
CGMA
6-CHANNEL/
12-BIT
PWMMC
A FLASH MCU SOLUTION
FEATURES
SERIAL COMMUNICATIONS INTERFACE
• UART asynchronous communications
system
• Flexible baud rate generator
• Double buffered transmit and receive
• Optional hardware parity checking and
generation
BENEFITS
• Asynchronous communication
between the MCU and a terminal,
computer or a network of
microcontrollers
68HC908MR8
PART NUMBER DESCRIPTION
M68ICS08MR
KITMMEVS08MR8
KITMMDS08MR8
RESALE*
RESALE
EASY-TO-ORDER DEVELOPMENT TOOL KITS
68HC908MRxx programmer/
in-circuit debug kit
Cost-effective real-time
in-circuit emulator kit
High-performance real-time
in-circuit emulator kit
$295
COMPUTER OPERATING PROPERLY WATCHDOG TIMER
$1450
$3950
• Provides system protection in the
event of runaway code by resetting
the MCU to a known state
INDIVIDUAL DEVELOPMENT TOOL COMPONENTS
M68MMDS0508
M68MMPFB0508
M68EM08MR8
M68CBL05C
M68TC08MR8P28
M68TC08MR8FA32
M68TQS032SAG1
M68TQP032SA1
M68DIP28SOIC
High-performance emulator
MMEVS platform board
Emulation module daughter board
Low-noise flex cable
28-pin DIP/SOIC target head
adapter
32-pin QFP target head adapter
32-pin TQ socket with guides
32-pin TQPACK
28-pin SOIC surface mount
adapter
$2950
$395
$495
$120
$250
$250
$50
$70
$50
LOW-VOLTAGE INHIBIT
• Improves reliability by resetting the
MCU when voltage drops below trip
point
• Integration reduces system cost
UP TO 14 BIDIRECTIONAL INPUT/OUTPUT (I/O) LINES
• 10 mA sink/source capability on all I/O
pins
• 15 mA sink capability on five I/O pins
• Keyboard scan with selectable
interrupts on five I/O pins
• Software programmable pullups on
five I/O pins
• High-current I/O allows direct drive of
LED and other circuits to eliminate
external drivers and reduce system
costs
• Keyboard scan with programmable
pullups eliminates external glue logic
when interfacing to simple keypads
APPLICATION NOTES
•
•
•
•
•
•
•
•
AN1857/D A 3-Phase AC Induction Motor Control System
AN2093/D Creating Efficient C Code for the MC68HC08
AN1219/D M68HC08 Integer Math Routines
AN1218/D HC05 to HC08 Optimization
AN1837/D Non-Volatile Memory Technology Review
AN1752/D Data Structures for 8-bit MCUs
AN1705/D Noise Reduction Techniques for MCU-Based Systems
AN1259/D System Design and Layout Techniques for Noise
Reduction in MCU-Based Systems
• AN1263/D Designing for Electromagnetic Compatibility with
Single-Chip Microcontrollers
• AN1050/D Designing for Electromagnetic Compatibility (EMC)
with HCMOS Microcontrollers
• AN1705/D Noise Reduction Techniques for Microcontroller-
Based Systems
And many more—see our Web site at
http://www.motorola.com/mcu
PACKAGE OPTIONS
PART NUMBER
MC68HC908MR8CFA
MC68HC908MR8CP
MC68HC908MR8CDW
MC68HC908MR8VFA
MC68HC908MR8VP
MC68HC908MR8VDW
PACKAGE
32 QFP
28 DIP
28 SOIC
32 QFP
28 DIP
28 SOIC
TEMPERATURE RANGE
-40 to 85ºC
-40 to 85ºC
-40 to 85ºC
-40 to 105ºC
-40 to 105ºC
-40 to 105ºC
SAMPLE PACKS
KMC68HC908MR8CFA
KMC68HC908MR8CP
KMC68HC908MR8CDW
PACKAGE
32 QFP
28 DIP
28 SOIC
TEMPERATURE RANGE
-40 to 85ºC
-40 to 85ºC
-40 to 85ºC
Motorola and the stylized M Logo are registered in the U.S. Patent and Trademark Office. All other
product or service names are the property of their respective owners.
© Motorola, Inc. 2002
* All prices are manufacturer’s suggested resale for North America.
68HC908MR8/4PB/D
Rev. 1
微控制器 MCU
