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General Description

Introduction

The MC68HC908MR32 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. 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 of the MC68HC908MR32 include:

? High-performance M68HC08 architecture

? Fully upward-compatible object code with M6805, M146805, and M68HC05 Families

? 8-MHz internal bus frequency

? On-chip FLASH memory with in-circuit programming capabilities of FLASH program memory:

MC68HC908MR32 — 32 Kbytes

MC68HC908MR16 — 16 Kbytes

? On-chip programming firmware for use with host personal computer

? FLASH data security(1)

? 768 bytes of on-chip random-access memory (RAM)

? 12-bit, 6-channel center-aligned or edge-aligned pulse-width modulator (PWMMC)

? Serial peripheral interface module (SPI)

? Serial communications interface module (SCI)

? 16-bit, 4-channel timer interface module (TIMA)

? 16-bit, 2-channel timer interface module (TIMB)

? Clock generator module (CGM)

? Low-voltage inhibit (LVI) module with software selectable trip points

? 10-bit, 10-channel analog-to-digital converter (ADC)

? System protection features:

– Optional computer operating properly (COP) reset

– Low-voltage detection with optional reset

– Illegal opcode or address detection with optional reset

– Fault detection with optional PWM disabling

? Available packages:

– 64-pin plastic quad flat pack (QFP)

– 56-pin shrink dual in-line package (SDIP)

? Low-power design, fully static with wait mode

? Master reset pin (RST) and power-on reset (POR)

? Stop mode as an option

? Break module (BRK) supports setting the in-circuit simulator (ICS) single break point

Features of the CPU08 include:

? Enhanced M68HC05 programming model

? Extensive loop control functions

? 16 addressing modes (eight more than the M68HC05)

? 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