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參數資料
| 型號： | MC68HC05V7 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁數： | 6/16頁 |
| 文件大小： | 295K |
| 代理商： | MC68HC05V7 |
MOTOROLA
6
AN1257/D
Printed Circuit Board Considerations
When designing the application printed circuit board (PCB), appropriate PCB layout techniques should be
used when routing power and ground to help reduce electromagnetic interference (EMI) problems. These
techniques can include the use of four (or more) layer boards, single-point grounds and micro-islands.
While ground and power planes can significantly reduce noise on a board, using them is not always an
option. Figure 3 illustrates one example of a 2-sided PCB power and ground layout for the MC68HC705V8
in a 68-pin PLCC package. On the top layer (viewed from the top), the two V
SSD
pins are tied together
through a low-impedance path and the V
SSD
, V
SSA
1,
and V
SSA
2
grounds are all routed back to the main
system ground using the single-point ground technique. The 12-volt and 5-volt supply lines are routed on
the bottom layer (here viewed from the bottom), including the low-impedance path connecting the two V
DD
pins. The V
CCA
supply is provided by the internal regulator output at pin 30. The preferred locations for the
5-volt supply output stabilization and decoupling capacitors also are shown. The layout in Figure 3 is
intended as an example only, not as the only correct layout solution for all applications.
For more information on various techniques for reducing EMI problems in PCB layout, refer to Motorola
Application Notes AN1050/D
Designing for Electromagnetic Compatibility (EMC) with HCMOS
Microcontrollers
and AN-1258/D
Proper Layout Techniques for Noise Reduction in MCU-Based Systems
.
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| MC68HC05X16 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:High-density complementary metal oxide semiconductor HCMOS) microcontroller unit |
| MC68HC05X32 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:High-density complementary metal oxide semiconductor HCMOS) microcontroller unit |
| MC68HC05X4 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05X4CDW | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05X4DW | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
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