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Introduction

The MC68HC05CT4 is a 44-pin member of the MC68HC05 Family of microcontrollers (MCUs), which supports cordless telephone applications. The memory map includes 5376 bytes of on-chip ROM and 256 bytes of RAM. The microcontroller unit has three 8-bit input/output (I/O) ports: A, B, and C; and one 7-bit I/O port: D. Port C has pullup options and keyscan capability. The MC68HC05CT4 includes a bird core, a bird timer, a synchronous serial interface (SSI), 16-bit timer, a dual 60-MHz phase-locked loop (PLL), pulse width modulator (PWM), and an on-chip computer operating properly (COP) watchdog circuit.

Features of the MC68HC05CT4 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 ROM

? 240 Bytes of Self-Check 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 Selectable Options:

¨C COP Watchdog Timer

¨C Edge-Sensitive or Edge- and Level-Sensitive Interrupt Trigger

¨C Port C Pullups for Keyscan

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

? Three Comparators

? ROM Security Feature