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General Description

Introduction

The MC68HC705CT4 is a 44-pin member of the M68HC05 Family that supports the cordless telephone applications. The memory map includes 5136 bytes of user EPROM, 240 bytes of boot ROM, and 256 bytes of RAM. The MCU has three 8-bit input/output (I/O) ports: A, B, C; and one 7-bit I/O, port D. Port C has pullup options and keyscan capability. The MC68HC705CT4 includes a bird core, a bird timer, a synchronous serial I/O (SSI), 16-bit timer, a dual 60-MHz phase-lock loop (PLL), and an on-chip computer operating properly (COP) watchdog circuit.

Features of the MC68HC705CT4 include:

? Low Cost

? HC05 Core

? 44-Pin Plastic Leaded Chip Carrier (PLCC) Package

? 10.24-MHz On-Chip Crystal Oscillator

? 2.048-MHz Internal CPU Speed

? 5136 Bytes of User EPROM

? 240 Bytes of Boot ROM

? 256 Bytes of On-Chip RAM

? 16-Bit Timer

? 31 Bidirectional I/O Lines

? Power-Saving Stop and Wait Modes

? Core Timer

? Dual 60-MHz PLL

? Simple Serial with Bidirectional Data (SSI)

? Keyscan Interrupt with Pullups on Port C

? Mask Options:

– COP Watchdog Timer

– Edge-Sensitive or Edge- and Level-Sensitive Interrupt Trigger

– Port C Pullups for Keyscan

– 1-Channel, 6-Bit Pulse Width Modulator (PWM)

? Three Comparators

? EPROM Security Feature