Freescale Semiconductor, Inc.
A FLASH MCU SOLUTION
68HC908LJ24/LK24
8-bit Microcontroller
FEATURES
BENEFITS
HIGH-PERFORMANCE 68HC08 CPU CORE
TARGET APPLICATIONS
• 8 MHz bus operation (at 5V) for 125 nsec
minimum instruction cycle time
• 4 MHz bus operation (at 3.3V) for 250 nsec
minimum instruction cycle time
• Efficient instruction set including multiply
and divide
• 16 flexible addressing modes including
multiply and divide
• Object code compatible with the 68HC05
• Easy to learn and use architecture
• C optimized architecture provides
compact code
• Portable audio/video
• Personal appliances
• Air conditioners
• Microwave ovens
• Boilers
• Cameras
• Fully static low-voltage, low-power design
with wait and stop modes
• Health care equipment
• Remote controls
• Electric power meters
• Thermostats
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
The 68HC908LJ24/LK24 is a fully integrated
• Reduces production programming costs
through ultra-fast programming
• Allows re-programmable battery-powered
applications
• Byte-writable for data, as well as
program memory
• Helps to protect code from unauthorized
reading and guards against unintentional
erasing/writing of user-programmable
segments of code
• Flash programming across the 68HC08
devices’ full operating supply voltage
with no extra programming voltage
• 10K write/erase cycles minimum
over temperature
• 100K write/erase typical
• Flexible block protection and security
microcontroller created to make system design
easier by eliminating external peripherals wherever
possible. The 32 KHz phase-locked loop (PLL)
eliminates the need for expensive, high-speed
crystals or noisy oscillators. The integrated second-
generation Flash memory programs up to 100 times
faster than previous Flash solutions and offers
in-application programming. Features include a
synchronous serial peripheral interface (SPI), an
asynchronous serial communications interface (SCI)
with infrared modulator/demodulator, a multi-master
• ROM-resident in-circuit programming and
emulated EEPROM routines
• ROM-resident programming routines
simplify user code
2
inter-IC (I C) bus, an analog-to-digital converter
(ADC), a liquid crystal display (LCD) driver, a
real-time clock (RTC), low-voltage inhibit (LVI)
and a watchdog timer.
10-BIT ANALOG-TO-DIGITAL CONVERTER
• Six channels
• Fast, easy conversion from analog inputs—
such as temperature, pressure and fluid
levels—to digital values for CPU
processing
• Single conversion in 8.5 µsec
The MC68HC908LJ24 supports crystals with
frequencies up to 4.9152 MHz. The MC68HC908LK24
uses a low-power oscillator that supports crystals
with a frequency of 32.768 KHz only.
CLOCK GENERATION MODULE WITH PLL
• Programmable clock frequency in integer
multiples of external crystal reference
• Provides high performance using cost
effective, 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)
CPU08
IRSCI
SPI
24K Flash
TWO PROGRAMMABLE 16-BIT TIMERS, EACH WITH TWO CHANNELS
• 125 nsec resolution at 8 MHz bus
• Free-running counter or module up-counter
• Independent external clock input option on
TIM1 and TIM2
• Each channel independently programmable
for input capture, output compare,
unbuffered PWM
• Pairing timer channels provides a buffered
PWM function
768 RAM
PLL
MIMIC
LCD
Two 2-ch.
16-bit timers
REAL-TIME CLOCK
• Second, minute, hour, day, day of week,
month, year counters
• Automatic calendar with leap
year adjustment
• 10 msec chronograph counter
• Alarm and seven periodic interrupts
• Provides auto-wakeup from low-power stop
mode to check external device status (such
as status of sensors)
• Auto-wakeup can be periodic or at a
defined time
RTC
LVI
6-ch. 10-bit
ADC
Up to 48
GPIO
COP
• Compensates for frequency errors in the
32.768 KHz crystal unbuffered PWM
• Automatic calibration and compensation
For More Information On This Product,
clock circuit
Go to: www.freescale.com
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