原标题：Freescale S08MM128医疗设备开发方案

　　freescale公司的 9S08MM128/64/32是Flexis 8位MCU，具有超低功耗，USB连接和支持图像显示以及无与伦比的测量精度。S08MM128工作电压2.4V时的CPU速率高达48MHz，支持多达 33条中断/重置源，128KB双阵列闪存读/编/除功能，12KB RAM，并具有安全电路，防止未许可接入RAM和闪存，并有多种外设接口，主要用在工业，仪表，医疗/保健如血压计，心率监视器，血糖仪，ECG等。本文介绍了S08MM128主要特性，方框图，以及开发工具TWR-S08MM128-KIT主要特性，方框图以及电路图。

　　The 9S08MM128/64/32 provides ultra-low-power operation, USB connectivity, graphic display support and unparalleled measurement accuracy, all in a single 8-bit microcontroller, allowing device designers to create more fully featured products at a lower cost.

　　The 9S08MM128/64/32 is ideal for medical applications or any other application requiring a significant amount of precision analog such as instrumentation and industrial control. The 9S08MM128/64/32 is part of the Freescale Flexis™ microcontroller series.

　　S08MM128主要特性：

　　8-Bit HCS08 Central Processor Unit (CPU)

　　– Up to 48-MHz CPU above 2.4 V, 40 MHz CPU above 2.1 V, and

　　20 MHz CPU above 1.8 V across temperature of -40°C to 105°C

　　– HCS08 instruction set with added BGND instruction

　　– Support for up to 33 interrupt/reset sources

　　On-Chip Memory

　　– 128 K Dual Array Flash read/program/erase over full operating voltage and temperature

　　– 12 KB Random-access memory (RAM)

　　– Security circuitry to prevent unauthorized access to RAM and Flash

　　Power-Saving Modes

　　– Two ultra-low power stop modes. Peripheral clock enable register can disable clocks to unused modules to reduce currents

　　– Time of Day (TOD) — Ultra-low power 1/4 sec counter with up to 64s timeout.

　　– Ultra-low power external oscillator that can be used in stop modes to provide accurate clock source to the TOD. 6 usec typical wake up time from stop3 mode

　　Clock Source Options

　　– Oscillator (XOSC1) — Loop-control Pierce oscillator; 32.768 kHz crystal or ceramic resonator dedicated for TOD operation.

　　– Oscillator (XOSC2) — for high frequency crystal input for MCG reference to be used for system clock and USB operations.

　　– Multipurpose Clock Generator (MCG) — PLL and FLL; precision trimming of internal reference allows 0.2% resolution and 2% deviation over temperature and voltage; supports CPU frequencies from 4 kHz to 48 MHz.

　　System Protection

　　– Watchdog computer operating properly (COP) reset Watchdog computer operating properly (COP) reset with option to run from dedicated 1-kHz internal clock source or bus clock

　　– Low-voltage detection with reset or interrupt; selectable trip points; separate low-voltage warning with optional interrupt; selectable trip points

　　– Illegal opcode and illegal address detection with reset

　　– Flash block protection for each array to prevent accidental write/erasure

　　– Hardware CRC to support fast cyclic redundancy checks

　　Development Support

　　– Single-wire background debug interface

　　– Real-time debug with 6 hardware breakpoints (4 PC, 1 address and 1 data) Breakpoint capability to allow single breakpoint setting during in-circuit debugging

　　– On-chip in-circuit emulator (ICE) debug module containing 3 comparators and 9 trigger modes

　　Peripherals

　　– CMT— Carrier Modulator timer for remote control communications. Carrier generator, modulator and driver for dedicated infrared out. Can be used as an output compare timer.

　　– IIC— Up to 100 kbps with maximum bus loading; Multi-master operation; Programmable slave address; Interrupt driven byte-by-byte data transfer; supports broadcast mode and 11-bit addressing

　　– PRACMP — Analog comparator with selectable interrupt; compare option to programmable internal reference voltage; operation in stop3

　　– SCI — Two serial communications interfaces with optional 13-bit break; option to connect Rx input to PRACMP output on SCI1 and SCI2; High current drive on Tx on SCI1 and SCI2; wake-up from stop3 on Rx edge

　　– SPI1— Serial peripheral interface (SPI) with 64-bit FIFO buffer; 16-bit or 8-bit data transfers; full-duplex or single-wire bidirectional; double-buffered transmit and receive; master or slave mode; MSB-first or LSB-first shifting

　　– SPI2— Serial peripheral interface with full-duplex or single-wire bidirectional; Double-buffered transmit and receive; Master or Slave mode; MSB-first or LSB-first shifting

　　– TPM — Two 4-channel Timer/PWM Module; Selectable input capture, output compare, or buffered edge- or center-aligned PWM on each channel; external clock input/pulse accumulator

　　– USB — Supports USB in full-speed device configuration. On-chip transceiver and 3.3V regulator help save system cost, fully compliant with USB Specification 2.0. Allows control, bulk, interrupt and isochronous transfers. Not available on MC9S08MM32A devices.

　　– ADC16 — 16-bit Successive approximation ADC with up to 4 dedicated differential channels and 8 single-ended channels; range compare function; 1.7 mV/C temperature sensor; internal bandgap reference channel; operation in stop3; fully functional from 3.6V to 1.8V, Configurable hardware trigger for 8 Channel select and result registers

　　– PDB — Programmable delay block with 16-bit counter and modulus and prescale to set reference clock to bus divided by 1 to bus divided by 2048; 8 trigger outputs for ADC16 module provides periodic coordination of ADC sampling sequence with sequence completion interrupt; Back-to-Back mode and Timed mode

　　– DAC— 12-bit resolution; 16-word data buffers with configurable watermark.

　　– OPAMP — Two flexible operational amplifiers configurable for general operations; Low offset and temperature drift.

　　– TRIAMP — Two trans-impedance amplifiers dedicated for converting current inputs into voltages.

　　Input/Output

　　– Up to 47 GPIOs and 2 output-only pin and 1 input-only pin.

　　– Voltage Reference output (VREFO).

　　– Dedicated infrared output pin (IRO) with high current sink capability.

　　– Up to 16 KBI pins with selectable polarity.

　　Package Options

　　– 81-MBGA 10x10 mm

　　– 80-LQFP 12x12 mm

　　64-LQFP 10x10 mm

　　S08MM128目标应用：

　　Industrial

　　Instrumentation

　　Medical/Healthcare

　　Blood Pressure Monitors

　　Heart Rate Monitors

　　Pulse Oximetry

　　Ultrasound

　　Telehealth System

　　Hospital Admission Machine

　　Blood Glucose Monitors (Glucometers)

　　Electrocardiograph (ECG)

　　Anesthesia Unit Monitor

　　Vital Signs Monitors

　　Defibrillators

　　图1。MC9S08MM128系列方框图

　　TWR-S08MM128-KIT医疗设备开发工具

　　The TWR-S08MM128-KIT is a medical-oriented development tool for the 9S08MM128 microcontroller.

　　This kit is part of the Freescale Tower System, a modular, reconfigurable development platform that allows designers to get to market faster with packaged evaluation boards, tools and runtime software.

　　The kit includes the MED-EKG which is an electrocardiograph sensor for medical applications development. The 9S08MM microcontroller module is designed to be a standalone debug tool and can also be purchased separately from the kit, part number TWR-S08MM128.

　　TWR-S08MM128-KIT医疗设备开发工具主要特性：

　　Freescale Tower System compliant

　　Integrated open-source BDM debugging tool

　　Small form factor (59mm x 90mm)

　　Supports external communications interfaces

　　Includes power regulation circuitry with standardized bus

　　Two 80-pin connectors on the outside to support debugging or expansion to LCD module RS232, RS485, CAN , USB

　　Open connector for MED-EKG development board

　　Low power

　　TWR-S08MM128-KIT医疗设备开发工具包括：

　　TWR-S08MM128 - 8-bit module that features the 9S08MM128

　　TWR-SER - Serial module that features Ethernet, USB, RS232/485 and CAN

　　TWR-ELEV - Two elevator boards that provide structural integrity, communications interfaces, power regulation circuitry with standardized bus

　　Necessary cables

　　MED-EKG - Electrocardiograph sensor to develop medical applications with Flexis MM Family

　　An interactive DVD with lab tutorials, software, training and collateral

　　A printed guide on how to quickly get started using the development kit

　　图2。TWR-S08MM128-KIT外形图

　　图3。TWR-S08MM128-KIT方框图