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MC68HC705P9CS датащи(PDF) 26 Page - Freescale Semiconductor, Inc |
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MC68HC705P9CS датащи(HTML) 26 Page - Freescale Semiconductor, Inc |
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26 / 160 page ![]() Pin Descriptions Technical Data MC68HC705P9 — Rev. 4.0 26 Pin Descriptions MOTOROLA 2.2 Pin Assignments Figure 2-1. Pin Assignments 2.3 Pin Functions 2.3.1 VDD and VSS VDD and VSS are the power supply and ground pins. The MCU operates from a single 5-V power supply. Very fast signal transitions occur on the MCU pins, placing high short-duration current demands on the power supply. To prevent noise problems, take special care to provide good power supply bypassing at the MCU as Figure 2-2 shows. Place the bypass capacitors as close as possible to the MCU. C2 is an optional bulk current bypass capacitor for use in applications that require the port pins to source high current levels. RESET IRQ/VPP PA7 PA6 PA5 PA4 PA3 PA2 PA1 PA0 PB5/SDO PB6/SDI PB7/SCK VSS VDD OSC1 OSC2 PD7/TCAP TCMP PD5 PC0 PC1 PC2 PC3/AN3 PC4/AN2 PC5/AN1 PC6/AN0 PC7/VRH 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 MCU C1 0.1 µF C2 VDD + Figure 2-2. Bypassing Recommendation Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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