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| 型号： | MC68HC05E1MP |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28 |
| 封装： | PLASTIC, DIP-28 |
| 文件页数： | 66/86页 |
| 文件大小： | 709K |
| 代理商： | MC68HC05E1MP |
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Timer, Phase-Locked Loop, and Custom Periodic Interrupt
Custom Periodic Interrupt
MC68HC05E1 — Revision 2.0
General Release Specication
MOTOROLA
Timer, Phase-Locked Loop, and Custom Periodic Interrupt
69
6.4.3 Noise Immunity
The MCU should be insulated as much as possible from noise in the
system. We recommend the following steps be taken to help prevent
problems due to noise injection.
1. The application environment should be designed so that the MCU
is not near signal traces which switch often, such as a clock signal,
2. The oscillator circuit for the MCU should be placed as close as
possible to the OSC1 and OSC2 pins on the MCU, and
3. All power pins should be filtered (to minimize noise on these
signals) by using bypass capacitors placed as close as possible to
the MCU.
See the Application Note
Designing for Electromagnetic Compatibility
(EMC) with HCMOS Microcontrollers, available through the Motorola
Literature Distribution Center, document number AN1050/D.
6.5 Custom Periodic Interrupt
The custom periodic interrupt is mask programmable to a 0.25 second,
0.5 second, or 1 second interrupt. The interrupt is generated from the 32
kHz OSC1 input by a 15-bit counter. This interrupt is under the control of
the Custom Periodic Interrupt Control and Status Register located at
$12.
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For More Information On This Product,
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