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MC68HC05J1ACDW Datasheet(PDF) 21 Page - Freescale Semiconductor, Inc |
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MC68HC05J1ACDW Datasheet(HTML) 21 Page - Freescale Semiconductor, Inc |
21 / 128 page General Description Pin Assignments MC68HC05J1A — Rev. 3.0 Technical Data MOTOROLA General Description 21 1.6 Pin Assignments Figure 1-2 shows the MC68HC05J1A pin assignments. Figure 1-2. Pin Assignments 1.6.1 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. Place bypass capacitors as close to the MCU as possible, as Figure 1-3 shows. C2 is an optional bulk current bypass capacitor for use in applications that require the port pins to source high current levels. 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 OSC1 OSC2 PB5 PB4 PB3 PB2 PB1 PB0 VDD VSS RESET IRQ PA0 PA1 PA2 PA3 PA4 PA5 PA6 PA7 Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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