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MC68HC908MR8
8-bit Microcontrollers
>
Appliance compressors
>
Smart appliances
> Industrial compressors
(
HVAC)
>
Variable speed pumps
(
well, gas)
>
HVAC blowers and fans
>
General-purpose drives
> Exercise equipment
>
Electric-powered
r
ecreational vehicles
>
Medical scanners/pumps
>
Printers/scanners/fax
m
achines
>
Electric lawn equipment
>
Throttle control
>
Seat module control
> Uninterruptible
p
ower supplies
HC08 CPU
8 KB Flash
LVI
Up to 14 GPIO
256 B RAM
6 x 12-bit PWM
SCI
4-ch. to 7-ch.,
10-bit ADC
2-ch. + 2-ch.,
16-bit Timer
F
eatures Benefits
H
igh-Performance 68HC08 CPU Core
>
8 MHz bus operation at 5V operation for
1
25 ns minimum instruction cycle time
>
Efficient instruction set, including multiply and divide
> 16 flexible addressing modes, including stack
r
elative with 16-bit stack pointer
> Fully static, low-voltage, low-power design
with wait and stop modes
>
Object code compatible with the 68HC05
> Easy to learn and use architecture
> C-optimized architecture provides compact code
I
ntegrated Second-Generation Flash Memory
> In-application reprogrammable
> E
xtremely fast programming, encoding
6
4B in as fast as 2 ms
> 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
f
ield software upgrades via in-application
p
rogrammability and reprogrammability
> 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 writing/erasing of
user-programmable segments of code
10-bit Analog-to-Digital Converter (ADC)
> Seven channels
> Single conversion in 8.5 µs
> Provides single or continuous conversion
> Generates an interrupt when input signal exceeds
a software programmable limit
12-bit Pulse-Width Modulation for Motor Control (PWMMC)
> Three complementary or six 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 multiphase
control capability
>
Reduces system cost through integration
of digital-to-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 optocoupling stage
> Guarantees immediate shutdown of the PWM
outputs ensuring motor and consumer safety
Target Applications
Overview
The MC68HC908MR8 improves design
capabilities for three-phase, variable-speed
motion control. Each device incorporates
fault-tolerant and flexible 6-channel, 12-bit
pulse-width modulation (PWM), supporting
center- and edge-aligned modes with automatic
dead-time insertion and patented dead-time
compensation capability. The MC68HC908MR8 is
designed to save money and space and includes
powerful features, such as 8 KB of Flash memory,
a 10-bit analog-to-digital converter (ADC), an
asynchronous serial communications interface
(SCI) and small outline packages.
Clock Generation Module with Phase-Lock Loop (PLL)
> 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)
