Introduction
The MC68HC908JB16 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.

Features
Features of the MC68HC908JB16 MCU 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
• 6-MHz internal bus frequency
• 16,384 bytes of on-chip FLASH memory with security1 feature
• 384 bytes of on-chip random access memory (RAM)
• Up to 21 general-purpose input/output (I/O) pins, including:
    – 15 shared-function I/O pins
    – 8-bit keyboard interrupt port
    – 10mA high current drive for PS/2 connection on 2 pins (with USB module disabled)
    – 1 dedicated I/O pin, with 25mA direct drive for infrared LED (32-pin package)
    – 6 dedicated I/O pins, with 25mA direct drive for infrared LED on 2 pins and 10mA direct drive for normal LED on 4 pins (28-pin package)
• Two 16-bit, 2-channel timer interface modules (TIM1 and TIM2) with selectable input capture, output compare, PWM capability on each channel, and external clock input option (TCLK)
• Universal Serial Bus specification 2.0 low-speed functions:
    – 1.5Mbps data rate
    – On-chip 3.3V regulator
    – Endpoint 0 with 8-byte transmit buffer and 8-byte receive buffer
    – Endpoint 1 with 8-byte transmit buffer
    – Endpoint 2 with 8-byte transmit buffer and 8-byte receive buffer
• Serial communications interface module (SCI)
• Dual clock generator modules (CGM) (32-pin package)
• In-circuit programming capability using USB communication or standard serial link on PTA0 pin
• System protection features:
    – Optional computer operating properly (COP) reset
    – Optional Low-voltage detection with reset
    – Illegal opcode detection with reset
    – Illegal address detection with reset
• Master reset pin with internal pull-up and power-on reset
• IRQ interrupt pin with internal pull-up and schmitt-trigger input
• 32-pin low-profile quad flat pack (LQFP) and 28-pin small outline integrated circuit package (SOIC)