Introduction
The MC68HC908JL8 is a member of the low-cost, high-performance M68HC08 Family of 8-bit microcontroller units (MCUs). The M68HC08 Family is based on the customer-specified integrated circuit (CSIC) design strategy. All MCUs in the family use the enhanced M68HC08 central processor unit (CPU08) and are available with a variety of modules, memory sizes and types, and package types.

FEATUREs
Features of the MC68HC908JL8 include the following:
• High-performance M68HC08 architecture,
• Fully upward-compatible object code with M6805, M146805, and M68HC05 Families
• Low-power design; fully static with stop and wait modes
• Maximum internal bus frequency:
   – 8-MHz at 5V operating voltage
   – 4-MHz at 3V operating voltage
• Oscillator options:
   – Crystal or resonator
   – RC oscillator
• 8,192 bytes user program FLASH memory with security1 feature
• 256 bytes of on-chip RAM
• Two 16-bit, 2-channel timer interface modules (TIM1 and TIM2) with selectable input capture, output compare, and PWM capability on each channel; external clock input option on TIM2
• 13-channel, 8-bit analog-to-digital converter (ADC)
• Serial communications interface module (SCI)
• 26 general-purpose input/output (I/O) ports:
   – 8 keyboard interrupt with internal pull-up
   – 11 LED drivers (sink)
   – 2 × 25mA open-drain I/O with pull-up
• Resident routines for in-circuit programming and EEPROM emulation
• System protection features:
   – Optional computer operating properly (COP) reset, driven by internal RC oscillator
   – Optional low-voltage detection with reset and selectable trip points for 3V and 5V operation
   – Illegal opcode detection with reset
   – Illegal address detection with reset
• Master reset pin with internal pull-up and power-on reset
• IRQ with schmitt-trigger input and programmable pull-up
• 20-pin dual in-line package (PDIP), 20-pin small outline integrated package (SOIC), 28-pin PDIP, 28-pin SOIC, 32-pin shrink dual in line package (SDIP), and 32-pin low-profile quad flat pack (LQFP)
• Specific features of the MC68HC908JL8 in 28-pin packages are:
   – 23 general-purpose I/Os only
   – 7 keyboard interrupt with internal pull-up
   – 10 LED drivers (sink)
   – 12-channel ADC
   – Timer I/O pins on TIM1 only
• Specific features of the MC68HC908JL8 in 20-pin packages are:
   – 15 general-purpose I/Os only
   – 1 keyboard interrupt with internal pull-up
   – 4 LED drivers (sink)
   – 10-channel ADC
   – Timer I/O pins on TIM1 only

FEATUREs of the CPU08 include the following:
• Enhanced HC05 programming model
• Extensive loop control functions
• 16 addressing modes (eight more than the HC05)
• 16-bit index register and stack pointer
• Memory-to-memory data transfers
• Fast 8 × 8 multiply instruction
• Fast 16/8 divide instruction
• Binary-coded decimal (BCD) instructions
• Optimization for controller applications
• Efficient C language support