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