8-bit Flash Microcontrollers
68HC908JK8/JL8
Target Applications
> Appliances
> Security systems
> Microwave applications
> Satellite receivers
> Automotive body electronics
> Sensors and flow
measurement devices
> Industrial compressor (HVAC)
> Instrument control panels
> HVAC blowers and fans
Features
High-Performance 68HC08 CPU Core
Benefits
> 8 MHz bus operation at 5V operation for
125 nsec minimum instruction cycle time
> 4 MHz bus operation at 3V for 250 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
Integrated Second-Generation Flash Memory
> Object code compatible with the 68HC05
> Easy to learn and use architecture
> C-optimized architecture provides
compact code
> In-application reprogrammable
> Extremely fast programming, encoding
64 bytes in as fast as 2 msec
> Flash programming across the 68HC08鈥檚 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 reprogrammability
> Reduces production programming costs
through ultra-fast programming
> Allows reprogrammable
battery-powered applications
> Byte-writable for data as well as
program memory
> Protects code from unauthorized reading and
guards against unintentional erasing/writing of
user-programmable segments of code
The 68HC908JL8 and the 68HC908JK8
use a 68HC08 CPU core and provide
cost-effective, reprogrammable Flash
with an integrated analog-to-digital converter
(ADC). This family also includes multiple clock
options, two 16-bit timer channels, low-voltage
inhibit (LVI) and a watchdog timer.
8-bit Analog-to-Digital Converter
> Up to 13 channels
> Single conversion in 17 碌sec
Multiple Clock Options
> Fast, easy conversion from analog inputs,
such as temperature, pressure and fluid levels
to digital values for CPU processing
> Crystal, ceramic or RC oscillator
> External clock
> Flexible clock options optimize timing
accuracy with system cost
HC08 CPU
Two Programmable 16-bit Timer Channels
> 125 nsec resolution at 8 MHz bus
8 KB Flash
KBI
> Free-running counter or modular
arithmetic up-counter
> Each channel independently programmable
for input capture, output compare or
unbuffered PWM
> Pairing timer channels provides a buffered
PWM function
256 RAM
13-ch., 8-bit
ADC
2-ch., 16-bit
Timer
Computer Operating Properly (COP) Watchdog Timer
> Provides system protection
Serial Communications Interface
SCI
COP
LVI
> UART asynchronous communications system
> Flexible baud rate generator
> Double buffered transmit and receive
> Optional hardware parity checking
and generation
> Asynchronous communication between the
MCU and a terminal, computer or a
network of microncontrollers
Up to 26 GPIO
1
2
