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参数资料
| 型号： | JMBADGE2008-B |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 16/18页 |
| 文件大小： | 0K |
| 描述： | BOARD JM BADGE |
| 标准包装： | 1 |
| 系列： | ColdFire®, Flexis™ |
| 类型： | MCU |
| 适用于相关产品： | MCF51JM128 |
| 所含物品： | 板，线缆，DVD 和指南 |
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4.4.3 Initialization ? code ?
It ? is ? highly ? recommended ? to ? keep ? the ? sys_init() ? function ? from ? the ? sample ? projects ? when ? developing ?
custom ? projects. ? This ? sets ? up ? the ? GPIO ? pins ? correctly ? for ? the ? badge ? board, ? and ? ensures ? very ? low ?
power ? consumption. ? Certain ? pins ? (particularly ? PTF2, ? which ? is ? connected ? to ? the ? magnetic ? buzzer), ?
can ? have ? very ? dramatic ? affects ? on ? current ? draw. ??
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Note ? that ? the ? initialization ? function ? turns ? off ? all ? system ? clocks ? except ? KBI ? and ? IRQ. ? The ? other ?
module ? clocks ? are ? only ? turned ? on ? when ? needed. ? See ? the ? SCGC1, ? SCGC2, ? and ? SCGC3 ? register ?
descriptions ? in ? Section ? 5.7.8 ? of ? the ? MCF51JM128 ? Reference ? Manual ? for ? more ? information. ??
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The ? clock ? is ? also ? set ? up ? to ? use ? Bypassed ? Low ? Power ? External ? (BLPE) ? mode, ? with ? a ? bus ? clock ? speed ? of ?
750 ? Hz. ? See ? Chapter ? 7 ? of ? the ? MCF51JM128 ? Reference ? Manual ? for ? more ? information. ?
4.4.4 Useful ? Information ?
The ? JM_Badge_Board.zip ? project ? contains ? sample ? code ? for ? using ? the ? touch ? sensor, ? accelerometer, ?
battery ? charger, ? speaker, ? and ? scrolling ? messages ? across ? the ? LED ? Matrix. ? This ? should ? help ? get ?
custom ? designs ? up ? and ? running ? quickly. ?
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For ? simple ? debugging, ? you ? can ? use ? the ? LED ? Matrix. ? PTAD ? controls ? which ? rows ? are ? activated. ??
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PTAD=0x00 ? means ? no ? LEDs ? will ? light ? up. ?
PTAD=0x01 ? will ? activate ? the ? 1 st ? row. ?
PTAD=0x02 ? will ? activate ? the ? 2 nd ? row ??
PTAD=0x1F ? will ? activate ? all ? the ? rows. ?
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PTED ? and ? PTDD ? control ? which ? column ? is ? lit. ? PTED ? controls ? the ? left ? 8 ? columns. ? PTDD ? controls ? the ?
right ? 8 ? columns. ? First ? negate ? the ? value ? to ? display, ? and ? then ? hold ? the ? badge ? upside ‐ down ? to ?
correctly ? read ? the ? value. ?
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PTED=~(0x01) ? will ? light ? up ? the ? left ? most ? column ? (Column ? #1) ?
PTED=~(0x03) ? will ? light ? up ? the ? two ? left ? most ? columns ? (Columns ? #1 ? and ? #2) ?
PTDD=~(0x80) ? will ? light ? up ? the ? right ? most ? column ? (Column ? #16) ?
PTDD=~(0x01) ? will ? light ? up ? column ? #9 ?
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See ? the ? Badge ? Errata ? page ? for ? important ? information ? on ? issues ? with ? the ? bootloader ? and ?
workarounds. ?
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JM ? Badge ? Board ? User’s ? Manual ?
Page ? 16 ? of ? 18 ?
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