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MB91F467BA データシート(PDF) 29 Page - Cypress Semiconductor |
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MB91F467BA データシート(HTML) 29 Page - Cypress Semiconductor |
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29 / 127 page  MB91460B Series Document Number: 002-04608 Rev. *A Page 28 of 126 5.6 Mode Pins (MD_x) These pins should be connected directly to the power supply or ground pins. To prevent the device from entering test mode accidentally due to noise, minimize the lengths of the patterns between each mode pin and power supply pin or ground pin on the printed circuit board as possible and connect them with low impedance. 5.7 Notes on Operating in PLL Clock Mode If the oscillator is disconnected or the clock input stops when the PLL clock is selected, the microcontroller may continue to operate at the free-running frequency of the self-oscillating circuit of the PLL. However, this self-running operation cannot be guaranteed. 5.8 Pull-up Control The AC standard is not guaranteed in case a pull-up resistor is connected to the pin serving as an external bus pin. |
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