Freescale Semiconductor, Inc.
A FLASH MCU SOLUTION
68HC908GR8/GR4
8-bit Microcontroller
TARGET APPLICATIONS
FEATURES
BENEFITS
• Sensors
• Industrial and
HIGH-PERFORMANCE 68HC08 CPU CORE
consumer communications
• 8 MHz bus operation at 5V operation for
125 nsec minimum instruction cycle time
• Object code compatible with the 68HC05
• Easy to learn and use architecture
• Home appliances
• Security systems
• 4 MHz bus operation at 3V for 250 nsec
minimum instruction cycle time
• C optimized architecture provides
compact code
• Efficient instruction set including multiply
and divide
• 16 flexible addressing modes including
stack relative with 16-bit stack pointer
The 68HC908GR8 and the 68HC908GR4 utilize
integrated second generation FLASH and are
enhanced with embedded, on-chip functions
that eliminate the need for external serial
components. The 32 kHz phase-locked loop
provides cost savings by replacing the need
for expensive, high-speed crystals or noisy
oscillators. The on-chip timebase module
(TBM) further reduces costs by eliminating
the need for external real-time clock and
wakeup circuitry. Other features of the
68HC908GR8 and the 68HC908GR4 are an
analog-to-digital converter (ADC), a serial
communications interface (SCI), a serial
peripheral interface (SPI), low-voltage inhibit
(LVI) and a watchdog timer.
• Fully static low-voltage, low-power design
with wait and stop modes
INTEGRATED SECOND GENERATION FLASH MEMORY
• In-application re-programmable
• Cost-effective programming changes and
field software upgrades via in-application
programmability and re-programmability
• Extremely fast programming, encoding
64 bytes in as fast as 2 msec
• Reduces production programming costs
through ultra-fast programming
• FLASH programming across the 68HC08’s
full operating supply voltage with no extra
programming voltage
• Allows re-programmable battery-powered
applications
• 10K write/erase cycles minimum over
temperature
• Byte-writable for data as well as program
memory
• 100K write/erase cycles typical
• Protects code from unauthorized reading
and to guard against unintentional
erasing/writing of user-programmable
segments of code
• Flexible block protection and security
8-BIT ANALOG-TO-DIGITAL CONVERTER
• 8/6 channels
• Fast, easy conversion from analog inputs
like temperature, pressure and fluid levels
to digital values for CPU processing
KBI
HC08 CPU
• Single conversion in 17 µsec
CLOCK GENERATION MODULE WITH PLL
8-ch 8-bit
8K/4K Flash
ADC
• Programmable clock frequency in integer
multiples of external crystal reference
• Provides high-performance using low-cost,
low-frequency reference crystals
• Crystal reference of 32 kHz to 100 kHz
• External clock option with or without PLL
• Reduces generated noise while still
providing high-performance (up to 32 MHz
internal clock)
SCI
SPI
384 RAM
PLL
FOUR PROGRAMMABLE 16-BIT TIMER CHANNELS
• 125 nsec resolution at 8 MHz bus
• Each channel independently programmable
for input capture, output compare or
unbuffered PWM
2-ch 16-bit
1-ch 16-bit
Timer
• Free-running counter or modulo up-counter
COP
LVI
• Pairing timer channels provides a buffered
PWM function
Up to 21 GPIO
TIMEBASE MODULE
• 8 user-selectable periodic real-time
interrupts
• Provides auto wakeup from low-power stop
mode to maintain real-time clock or check
external device status such as sensors
• Optionally operate in low-power stop mode
For More Information On This Product,
Go to: www.freescale.com
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