原标题：Freescale MC9RS08KB12 8位MCU入门开发方案

　　Freescale 公司的MC9RS08KB12/8/4/2(RS08KB)包括超低成本的入门级8位MCU,具有容易使用,设计灵活性和性能.RS08KB集成了多种外设和高效的RS08内核,支持中断,改善系统性能和节省其它元件成本. RS08KB有多达12KB闪存,256B RAM,高分辨率12路10位ADC,TPM,模块定时器和ACMP,以提供块速精密的检测和控制.目标应用在小家电,照明控制,低档热控制BLDC风扇,手持设备,电池充电器和玩具.本文介绍了MC9RS08KB12主要特性,方框图,以及DEMO9RS08KB12演示板主要特性和电路图.

　　The MC9RS08KB12/8/4/2 (RS08KB) family includes ultra-low-cost, entry-level 8-bit MCUs that balance ease of use with design flexibility and performance. The RS08KB family has an integrated peripheral set which includes a highly efficient RS08 core that supports interrupt capability, helping to improve system performance and save additional components costs. The RS08KB family eases migration by offering multiple package and flash size options, along with pin compatibility with other 5V families as well as the CodeWarrior development tool to support other 8-bit families. The family is available in 20, 16 or 8-pin packages, and features up to 12 KB flash and 254B RAM, high-resolution 12-ch., 10-bit ADC, TPM, modulo timers and ACMP to provide fast, precise sensing and control.

　　MC9RS08KB12主要特性:

　　• 8-Bit RS08 Central Processor Unit (CPU)

　　– Up to 20 MHz CPU at 1.8 V to 5.5 V across temperature range of –40℃ to 85℃

　　– Subset of HC08 instruction set with added BGND instruction

　　– Single Global interrupt vector

　　• On-Chip Memory

　　– Up to 12 KB flash read/program/erase over full operating voltage and temperature,12 KB/8 KB/4 KB/2 KB flash are optional

　　– Up to 254-byte random-access memory (RAM), 254-byte/126-byte RAM are optional

　　– Security circuitry to prevent unauthorized access to flash contents

　　• Power-Saving Modes

　　– Wait mode — CPU shuts down; system clocks continue to run; full voltage regulation

　　– Stop mode — CPU shuts down; system clocks are stopped; voltage regulator in standby

　　– Wakeup from power-saving modes using RTI, KBI, ADC, ACMP, SCI and LVD

　　• Clock Source Options

　　– Oscillator (XOSC) — Loop-control Pierce oscillator; crystal or ceramic resonator range of 31.25 kHz to 39.0625 kHz or 1 MHz to 16 MHz

　　– Internal Clock Source (ICS) — Internal clock source module containing a frequency-locked-loop (FLL) controlled by internal or external reference; precision trimming of internal reference allows 0.2% resolution and 2% deviation over temperature and voltage; supporting bus frequencies up to 10 MHz

　　• System Protection

　　– Watchdog computer operating properly (COP) reset with option to run from dedicated 1 kHz internal low power oscillator

　　– Low-voltage detection with reset or interrupt

　　– Illegal opcode detection with reset

　　– Illegal address detection with reset

　　– Flash-block protection

　　• Development Support

　　– Single-wire background debug interface

　　– Breakpoint capability to allow single breakpoint setting during in-circuit debugging

　　• Peripherals

　　– ADC — 12-channel, 10-bit resolution; 2.5 μs conversion time; automatic compare function; 1.7 mV/℃ temperature sensor; internal bandgap reference channel; operation in stop; hardware trigger; fully functional from 2.7 V to 5.5 V

　　– ACMP — Analog comparator; full rail-to-rail supply operation; option to compare to fixed internal bandgap reference voltage; can operate in stop mode

　　– TPM — One 2-channel timer/pulse-width modulator module; selectable input capture, output compare, or buffered edge- or center-aligned PWM on each channel

　　– IIC — Inter-integrated circuit bus module capable of operation up to 100 kbps with maximum bus loading; capable of higher baud rates with reduced loading

　　– SCI — One serial communications interface module with optional 13-bit break; LIN extensions

　　– MTIM — Two 8-bit modulo timers; optional clock sources

　　– RTI — One real-time clock with optional clock sources

　　– KBI — Keyboard interrupts; up to 8 ports

　　• Input/Output

　　– 18 GPIOs in 20-pin package; 14 GPIOs in 16-pin package; 6 GPIOs in 8-pin package; including one output-only pin and one input-only pin

　　– Hysteresis and configurable pullup device on all input pins; configurable slew rate and drive strength on all output pins

　　• Package Options

　　– MC9RS08KB12/MC9RS08KB8/MC9RS08KB4

　　— 20-pin SOIC, 16-pin SOIC NB or TSSOP

　　– MC9RS08KB2

　　— 8-pin SOIC or DFN

　　MC9RS08KB12目标应用:

　　Small appliances

　　Lighting control

　　Simple logic replacements

　　Low-end thermal controlled BLDC fans

　　Hand-held devices

　　Battery chargers

　　Toys

　　图1.MC9RS08KB12系列方框图

　　DEMO9RS08KB12演示板

　　The 8-bit DEMO9RS08KB12 demonstration kit soldered with 20SOIC KB12, comes with everything required to complete an entire entry-level project using the RS08KB. The perfect solution that allows you to develop your next cost-effective application.

　　DEMO9RS08KB12演示板主要特性:

　　MC9S08KB12, 20 SOIC

　　12K Bytes Flash

　　256 Bytes RAM

　　12Ch, 10-bit ADC

　　2-Ch, Timer/PWM

　　Internal Clock Source

　　18 GPIO

　　Optional 32 kHz XTAL (not installed)

　　Integrated USB-BDM

　　BDM_PORT header for BDM cable support (not installed)

　　MCU_PORT socket header for access to MCU IO signals

　　On-board +5V regulator

　　Power Input Selection Jumpers

　　Power input from USB-BDM

　　Power input from Barrel connector and on-board regulator

　　Power Input from connector J1

　　Optional Power output through Connector J1

　　User Components Provided

　　Push Switches; 2 User, 1 Reset

　　LED Indicators; 2 User, VDD, D300

　　5K ohm POT w /LP Filter

　　Light Sensor w/ Amplifier

　　Jumpers

　　Power Select

　　VSEL

　　VX_EN

　　USER_EN

　　COM_EN

　　VPPE

　　Connectors

　　40-pin MCU I/O Connector

　　2.0mm Barrel Connector

　　BDM_PORT (not installed)

　　USB Connectors

　　DB9 Connector

　　图2.DEMO9RS08KB12演示板外形图

　　图3.DEMO9RS08KB12演示板电路图