General Description

Introduction
The MC68HC08GR32A and MC68HC08GR16A are members 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
For convenience, features have been organized to reflect:
• Standard features of the MC68HC08GR32A and MC68HC08GR16A
• Features of the CPU08

Standard Features of the MC68HC08GR32A and MC68HC08GR16A
Features include:
• High-performance M68HC08 architecture optimized for C-compilers
• Fully upward-compatible object code with M6805, M146805, and M68HC05 Families
• 8-MHz internal bus frequency
• Clock generation module supporting 1-MHz to 8-MHz crystals
• System protection features:
    – Optional computer operating properly (COP) reset
    – Low-voltage detection with optional reset and selectable trip points for 3.3-V and 5.0-V operation
    – Illegal opcode detection with reset
    – Illegal address detection with reset
• Low-power design; fully static with stop and wait modes
• Standard low-power modes of operation:
    – Wait mode
    – Stop mode
• Master reset pin and power-on reset (POR)
• On-chip read-only memory (ROM)
    – MC68HC08GR32A — 32,256 bytes
    – MC68HC08GR16A — 15,872 bytes
• 1536 bytes of on-chip random-access memory (RAM)
• 32,256 bytes of read-only memory (ROM)
• Serial peripheral interface (SPI) module
• Enhanced serial communications interface (ESCI) module
• One 16-bit, 2-channel timer interface module (TIM1) with selectable input capture, output compare, and pulse-width modulation (PWM) capability on each channel
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FEATUREs of the CPU08
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
• Efficient C language support