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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M68ICS08GR датащи(PDF) 176 Page - Freescale Semiconductor, Inc |
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M68ICS08GR датащи(HTML) 176 Page - Freescale Semiconductor, Inc |
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176 / 408 page  Keyboard Interrupt (KBI) Technical Data MC68HC908GR8 — Rev 4.0 176 Keyboard Interrupt (KBI) MOTOROLA 13.4 Functional Description Writing to the KBIE3–KBIE0 bits in the keyboard interrupt enable register independently enables or disables each port A pin as a keyboard interrupt pin. Enabling a keyboard interrupt pin also enables its internal pullup device. A logic 0 applied to an enabled keyboard interrupt pin latches a keyboard interrupt request. A keyboard interrupt is latched when one or more keyboard pins goes low after all were high. The MODEK bit in the keyboard status and control register controls the triggering mode of the keyboard interrupt. • If the keyboard interrupt is edge-sensitive only, a falling edge on a keyboard pin does not latch an interrupt request if another keyboard pin is already low. To prevent losing an interrupt request on one pin because another pin is still low, software can disable the latter pin while it is low. • If the keyboard interrupt is falling-edge and low-level sensitive, an interrupt request is present as long as any keyboard interrupt pin is low and the pin is keyboard interrupt enabled. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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