General Description
Introduction
The MC68HC908AS32A 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
• 8.4 MHz internal bus frequency
• 32,256 bytes of FLASH electrically erasable read-only memory (FLASH)
• FLASH data security(1)
• 512 bytes of on-chip electrically erasable programmable read-only memory with security option (EEPROM)(1)
• 1 Kbyte of on-chip RAM
• Clock generator module (CGM)
• Serial peripheral interface module (SPI)
• Serial communications interface module (SCI)
• 8-bit, 15-channel analog-to-digital converter (ADC)
• 16-bit, 6-channel timer interface module (TIM)
• Programmable interrupt timer (PIT)
• System protection features
   – Computer operating properly (COP) with optional reset
   – Low-voltage detection with optional reset
   – Illegal opcode detection with optional reset
   – Illegal address detection with optional reset
• Low-power design (fully static with stop and wait modes)
• Master reset pin and power-on reset
• SAE J1850 byte data link controller digital module

Features of the CPU08 include:
• 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
• C language support