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1.2 Features

Features include:

? High-performance M68HC08 CPU core

? Fully upward-compatible object code with M68HC05 Family

? 5-V and 3-V operating voltages (VDD)

? 8-MHz internal bus operation at 5 V, 4-MHz at 3 V

? Trimmable internal oscillator

– Software selectable 1 MHz, 2 MHz, or 3.2 MHz internal bus operation

– 8-bit trim capability

– ±25 untrimmed

– Trimmable to approximately 0.4(1)

? Software selectable crystal oscillator range, 32–100 kHz, 1–8 MHz and 8–32 MHz

? Software configurable input clock from either internal or external source

? Auto wakeup from STOP capability using dedicated internal 32-kHz RC or bus clock source

? On-chip in-application programmable FLASH memory

– Internal program/erase voltage generation

– Monitor ROM containing user callable program/erase routines

– FLASH security(2)

General Description

? On-chip random-access memory (RAM)

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

? 6-channel, 10-bit analog-to-digital converter (ADC) with internal bandgap reference channel

(ADC10)

? Up to 13 bidirectional input/output (I/O) lines and one input only:

– Six shared with KBI

– Six shared with ADC

– Two shared with TIM

– One input only shared with IRQ

– High current sink/source capability on all port pins

– Selectable pullups on all ports, selectable on an individual bit basis

– Three-state ability on all port pins

? 6-bit keyboard interrupt with wakeup feature (KBI)

– Programmable for rising/falling or high/low level detect

? Low-voltage inhibit (LVI) module features:

– Software selectable trip point

? System protection features:

– Computer operating properly (COP) watchdog

– Low-voltage detection with reset

– Illegal opcode detection with reset

– Illegal address detection with reset

? External asynchronous interrupt pin with internal pullup (IRQ) shared with general-purpose input

pin

? Master asynchronous reset pin with internal pullup (RST) shared with general-purpose input/output

(I/O) pin

? Memory mapped I/O registers

? Power saving stop and wait modes

? MC68HC908QY4A, MC68HC908QY2A and MC68HC908QY1A are available in these packages:

– 16-pin plastic dual in-line package (PDIP)

– 16-pin small outline integrated circuit (SOIC) package

– 16-pin thin shrink small outline packages (TSSOP)

? MC68HC908QT4A, MC68HC908QT2A and MC68HC908QT1A are available in these packages:

– 8-pin PDIP

– 8-pin SOIC

– 8-pin dual flat no lead (DFN) package

Features of the CPU08 include the following:

? 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