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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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EM6812F2TP24B датащи(PDF) 37 Page - EM Microelectronic - MARIN SA |
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EM6812F2TP24B датащи(HTML) 37 Page - EM Microelectronic - MARIN SA |
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37 / 81 page  R EM6812 Copyright © 2005, EM Microelectronic-Marin SA 37 www.emmicroelectronic.com 10.1.3 IO Operation Port A input terminal status can always be read directly. All registers influencing the IO modes are bit-wise selectable. The integrated switchable pull resistors and the selectable output drive mode allow a maximum of different terminal modes. Refer to Table 32. Port A IO mode for the details. The default state after power up on all PA terminals is input mode with pull-down resistor. Table 32. Port A IO modes Modes Notes Input mode 0 X X 0 0 High-Z Needs external drive (PA[i] must never be floating) Input mode with pull-up 0 X X 1 X Weak Hi Pull-up has priority over pull-down Input mode with pull-down 0 X X 0 1 Weak Lo Default state after Power-up Output mode, CMOS high drive 1 1 0 X X 1 Pull resistors disabled Output mode, CMOS low drive 1 0 0 X X 0 Pull resistors disabled Output mode, open drain, high-Z 1 1 1 0 X High-Z Pull-down disabled Needs external drive (PA[i] must never be floating) Output mode, open drain with pull-up 1 1 1 1 X Weak Hi Pull-up active Output mode, open drain drive low 1 0 1 X X 0 Pull-up disabled Note: Every port A input always needs at least one driver. A floating input can generate hazards and may induce cross current in the input amplifier. Note: Avoid high frequency operation and fast transitions on PA7 while the 32kHz Crystal Oscillator is running. PA7 induced crosstalk on OscOut terminal (PCB, Package) can influence the good Crystal operation. |
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