Introduction
The MC68HC908QL4 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 CPU core
• Fully upward-compatible object code with M68HC05 Family
• 5-V and 3.3-V operating voltages (VDD)
• 8-MHz internal bus operation at 5 V, 4-MHz at 3.3 V
• Software configurable input clock from either internal or external source
• Trimmable internal oscillator
   – Selectable 1 MHz, 2 MHz, or 3.2MHz or 6.4 MHz internal bus operation
   – 8-bit trim capability
   – Trimmable to approximately 0.4%(1)
   – ± 25% untrimmed
• Software selectable crystal oscillator range, 32–100 kHz, 1–8 MHz, and 8–32 MHz
• Auto wakeup from STOP capability using dedicated internal 32-kHz RC or bus clock source
• On-chip in-application programmable FLASH memory
   – Internal program/erase voltage generation
   – Monitor ROM containing user callable program/erase routines
   – FLASH security(2)
• On-chip random-access memory (RAM)
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