Freescale公司的血壓計(jì)(BPM)參考設(shè)計(jì)采用MC9S08QE128作為微控制器,具有控制,數(shù)據(jù)保持,模擬采集和連接功能以及能和用戶接口.參考設(shè)計(jì)具有多種優(yōu)勢:采用MC9S08JM60作為USB通信的橋,采用MC13202ZigBee收發(fā)器進(jìn)行2.4GHz通信,采用MRAM來存儲用戶數(shù)據(jù)和通信,MRAM驅(qū)動器能存取MRAM存儲器,采用OLED作為用戶顯示,MPR083接近式傳感器用作用戶接口,以及用兩個(gè)定時(shí)PWM模塊作為音頻反饋.本文首先介紹了MC9S08QE128主要特性和方框圖.接著介紹了血
Freescale公司的血壓計(jì)(BPM)參考設(shè)計(jì)采用MC9S08QE
128作為微控制器,具有控制,數(shù)據(jù)保持,模擬采集和連接功能以及能和用戶接口. 參考設(shè)計(jì)具有
多種優(yōu)勢:采用
MC9S08JM60作為
USB通信的橋,采用MC13202 ZigBee收發(fā)器進(jìn)行2.4GHz通信,采用MRAM來存儲用戶數(shù)據(jù)和通信,MRAM驅(qū)動器能存取MRAM存儲器,采用OLED作為用戶顯示, MPR083接近式
傳感器用作用戶接口,以及用兩個(gè)定時(shí)PWM
模塊作為音頻反饋.本文首先介紹了MC9S08QE128主要特性和方框圖.接著介紹了血壓計(jì)(BPM)參考設(shè)計(jì)的硬件方框圖和軟件架構(gòu)流程圖,以及詳細(xì)電路圖和所用材料清單.
MC9S08QE128主要特性:
• 8-Bit HCS08 Central Processor Unit (
CPU)
&nd
ash; Up to 50.33-MHz HCS08 CPU above 2.4V, 40-MHz CPU above 2.1V, and 20-MHz CPU above 1.8V, across temperature range
– HC08 instructi
onsetwith added BGND instruction
– Support for up to 32 interrupt/reset sources
• On-Chip Memory
– Flash read/program/erase over full operating voltage and temperature
– Random-access memory (RAM)
– Security circuitry to prevent unauthorized access to RAM and flash contents
• Power-Saving Modes
– Two low power stop modes; reduced power wait mode
– Peripheral clock enable register can disable clocks to unused modules, reducing currents; allows clocks to remain enabled to specific peripherals in stop3 mode
– Very low power external oscillator can be used in stop3 mode to provide accurate clock to active peripherals
– Very low power real time counter for use in run, wait, and stop modes with internal and external clock sources
– 6 &
mu;s typical wake up time from stop modes
• Clock Source Options
– Oscillator (XOSC) — Loop-control Pierce oscillator; Crystal or ceramic resonator range of 31.25 kHz to 38.4 kHz or 1 MHz to 16 MHz
– Internal Clock Source (
ICS) — FLL controlled by internal or external reference; precision trimming of internal reference allows 0.2% resolution and 2% deviation; supports CPU freq. from 2 to 50.33 MHz
• System Protection
– Watchdog computer operating properly (
COP) reset with option to run from dedicated 1-kHz internal clock source or bus clock
