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MC68HC708AS48 データシート(PDF) 33 Page - Freescale Semiconductor, Inc |
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MC68HC708AS48 データシート(HTML) 33 Page - Freescale Semiconductor, Inc |
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33 / 396 page  General Description Pin Assignments MC68HC708AS48 — Rev. 4.0 Advance Information MOTOROLA General Description 33 1.5.1 Power Supply Pins (VDD and VSS) VDD and VSS are the power supply and ground pins. The MCU operates from a single power supply. Fast signal transitions on MCU pins place high, short-duration current demands on the power supply. To prevent noise problems, take special care to provide power supply bypassing at the MCU as Figure 1-4 shows. Place the C1 bypass capacitor as close to the MCU as possible. Use a high-frequency-response ceramic capacitor for C1. C2 is an optional bulk current bypass capacitor for use in applications that require the port pins to source high current levels. Figure 1-4. Power Supply Bypassing VSS is also the ground for the port output buffers and the ground return for the serial clock in the serial peripheral interface module (SPI). (See Section 18. Serial Peripheral Interface (SPI).) NOTE: VSS must be grounded for proper MCU operation. MCU V DD C2 C1 0.1 µF V SS V DD + NOTE: Component values shown represent typical applications. |
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