General Description
Introduction
The MC68HC908JL16 is a member of the low-cost, high-performance M68HC08 Family of 8-bit microcontroller units (MCUs). 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 include:
• 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 5-V operating voltage
   – 4-MHz at 3-V operating voltage
• Oscillator options:
   – Crystal or resonator
   – RC oscillator
• 16,384 bytes user program FLASH memory with security(1)
• 512 bytes of on-chip random-access memory (RAM)
• Two 16-bit, 2-channel timer interface modules (TIM1 and TIM2) with selectable input capture, output compare, and pulse-width modulation (PWM) capability on each channel; external clock input option on TIM2
• 13-channel, 10-bit analog-to-digital converter with internal bandgap reference channel (ADC10)
• Serial communications interface module (SCI)
• Multi-master IIC module (MMIIC)
• Up to 26 general-purpose input/output (I/O) ports:
   – 8 keyboard interrupt with internal pull up
   – 11 LED drivers (sink)
   – 2 × 25 mA open-drain I/O with pull up
   – Inputs contain hysteresis buffer for improved noise immunity
• 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 3-V and 5-V 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
• The MC68HC908JL16 is available in the following packages:
   – 28-pin plastic dual in-line package (PDIP)
   – 28-pin small outline integrated package (SOIC)
   – 32-pin shrink dual in-line package (SDIP)
   – 32-pin low-profile quad flat pack (LQFP)
• Specific features in 28-pin packages are:
   – 23 general-purpose I/Os only
   – 7 keyboard interrupt with internal pull up
   – 10 light-emitting diode (LED) drivers (sink)
   – 12-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