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68HC705JB4 Datasheet(PDF) 16 Page - Freescale Semiconductor, Inc |
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68HC705JB4 Datasheet(HTML) 16 Page - Freescale Semiconductor, Inc |
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16 / 134 page  GENERAL RELEASE SPECIFICATION February 24, 1999 MOTOROLA GENERAL DESCRIPTION MC68HC05JB4 1-4 REV 2 Figure 1-2. MC68HC05JB4 Pin Assignment 1.4 FUNCTIONAL PIN DESCRIPTION The following paragraphs give a description of the general function of each pin assigned in Fig. 1-2 and Fig. 1-3. 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) The frequency, fOSC, of the oscillator or external clock source is divided by two to produce the internal operating frequency, fOP. If the internal operating frequency is 3MHz, then the external oscillator frequency will be 6MHz. For LS USB 1.5MHz 28 27 26 25 24 23 22 21 20 19 18 1 2 3 4 5 6 7 8 9 10 11 PA5 VSS PA4/IRQ2 IRQ PA6 PB2 RESET OSC1 OSC2 PB3/AD4 PB4/AD5 PC0/AD0 PC2/AD2 PC1/AD1 PC4/VRH PC5/VRL 3.3V 12 13 14 PA2 PA3 17 16 15 D+ D– VDD PC3/AD3 PA1 PA0 PA7 PB1 PB0/ICAP1 Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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