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MC68HC908RF2 — Rev. 4.0

Data Sheet

MOTOROLA

General Description

Data Sheet — MC68HC908RF2

Section 1. General Description

1.1 Introduction

The MC68HC908RF2 MCU is a member of the low-cost, high-performance

M68HC08 Family of 8-bit microcontroller units (MCUs). Optimized for low-power

operation and available in a small 32-pin low-profile quad flat pack (LQFP), this

MCU is well suited for remote keyless entry (RKE) transmitter designs.

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.

1.2 Features

Features MCU include:

•

High-performance M68HC08 architecture

•

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

Families

•

Maximum internal bus frequency of 4 MHz at 3.3 volts

•

Maximum internal bus frequency of 2 MHz at 1.8 volts

•

Internal oscillator requiring no external components:

–

Software selectable bus frequencies

–

± 25 percent accuracy with trim capability to ±2 percent

–

Option to allow use of external clock source or external crystal/ceramic

resonator

•

2 Kbytes of on-chip FLASH memory

•

FLASH program memory security(1)

•

128 bytes of on-chip RAM

•

16-bit, 2-channel timer interface module (TIM)

1. No security feature is absolutely secure. However, Motorola’s strategy is to make reading or

copying the FLASH difficult for unauthorized users.

Freescale Semiconductor, Inc.

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