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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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68HC705JB3 데이터시트(PDF) 16 Page - Freescale Semiconductor, Inc |
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68HC705JB3 데이터시트(HTML) 16 Page - Freescale Semiconductor, Inc |
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16 / 134 page  GENERAL RELEASE SPECIFICATION November 5, 1998 MOTOROLA GENERAL DESCRIPTION MC68HC05JB3 1-4 REV 1 Figure 1-2. MC68HC05JB3 Pin Assignments 1.4 FUNCTIONAL PIN DESCRIPTION The following paragraphs give a description of the general function of each pin assigned in Figure 1-2. 1.4.1 VDD and VSS Power is supplied to the MCU through VDD and VSS. VDD is the positive supply, and VSS is ground. The MCU operates from a single power supply. Very fast signal transitions occur on the MCU pins. The short rise and fall times place very high short-duration current demands on the power supply. To prevent noise problems, special care should be taken to provide good power supply bypassing at the MCU by using bypass capacitors with good high-frequency char- acteristics that are positioned as close to the MCU as possible. Bypassing requirements vary, depending on how heavily the MCU pins are loaded. 1.4.2 OSC1, OSC2 The OSC1 and OSC2 pins are the connections for the on-chip oscillator. The OSC1 and OSC2 pins can accept the following sets of components: 1. A crystal as shown in Figure 1-3(a) 2. A ceramic resonator as shown in Figure 1-3(a) 3. An external clock signal as shown in Figure 1-3(b) 28 27 26 25 24 23 22 21 20 19 18 1 2 3 4 5 6 7 8 9 10 11 PA6 PB7 PA5 PB4 PA7 PA3 PB5 D+ D– PC2 PA2 PA1 RESET PA0 OSC1 OSC2 VSS 12 13 14 PB2 IRQ 17 16 15 PC0/OCMP PC1 3.3V VDD PB1 PB0/TCAP PB6 PC3 PA4 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 PA5 IRQ PA4 PB2 PA7 PA6 PA3 PA2 PA1 RESET PA0 OSC1 OSC2 VSS 3.3V D+ D– VDD PB0/TCAP PB1 20-pin package 28-pin package Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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