The 68HC908GR8 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.

• High-performance M68HC08 architecture optimized for C-compiler
• Fully upward-compatible object code with M6805, M146805, and M68HC05 families
• 8MHz internal bus frequency at 85�C
• FLASH program memory security
• On-chip programming firmware for use with host personal computer which does not require high voltage for entry
• In-system programming
• System protection features:
  • Optional Computer Operating Properly (COP) reset
  • Low-voltage detection with optional reset
  • Illegal opcode detection with optional reset
  • Illegal address detection with optional reset (Non-Expanded mode)
• Low-power design (fully static with STOP and WAIT modes)
• Master reset pin and power-on reset (POR)
• 7680 bytes of on-chip FLASH memory on the MC68HC908GR8 and 4096 bytes of on-chip FLASH memory on the MC68908GR4 with in-circuit programming capabilities of FLASH program memory
• 384 bytes of on-chip random-access memory (RAM)
• Serial peripheral interface module (SCI)
• One 16-bit, 2-channel timer (TIM1) and one 16-bit, 1-channel timer (TIM2) interface modules with selectable input capture, output compare, and PWM capability on each channel
• 6-channel, 8-bit successive approximation analog-to-digital converter (ADC)
• Break module (BRK) to allow single breakpoint setting during in-circuit debugging
• Internal pullups on IRQ and RST to reduce customer system cost
• Clock generator module with on-chip 32-kHz crystal compatible PLL (phase-lock loop)
• Up to 21 general -purpose input/output (I/O) pins, including:
  • 19 shared-function I/O pins
  • Up to two dedicated I/O pins, depending on package choice
• High current 10-mA sink/10-mA source capability on all port pins
• Higher current 15-mA sink/source capability on PTC0-PTC1
• Timebase module with clock prescaler circuitry for eight user selectable periodic real-time interrupts with optional active clock source during stop mode for periodic wakeup from stop using an external 32-kHz crystal
• Oscillator stop mode enable bit (OSCSTOPENB) in the CONFIG register to allow user selection of having the oscillator enabled ordisabled during stop mode
• 4-bit keyboard wakeup port
• 32-pin quad flat pack (QFP) or 28-pin palstic dual-in-line package (DIP) or 28-pin small outline integrated circuit (SOIC)
• Specific features of the MC68HC908GR8 in 28-pin DIP and 28-pin SOIC are:
  • Port B is only 4 bitsL PTB0-PTB3; 4-channel ADC module
  • No port C bits