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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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ATmega16 Scheda tecnica(PDF) 36 Page - ATMEL Corporation |
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ATmega16 Scheda tecnica(HTML) 36 Page - ATMEL Corporation |
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36 / 357 page  36 2466S–AVR–05/09 ATmega16(L) JTAG Interface and On-chip Debug System If the On-chip debug system is enabled by the OCDEN Fuse and the chip enter Power down or Power save sleep mode, the main clock source remains enabled. In these sleep modes, this will contribute significantly to the total current consumption. There are three alternative ways to avoid this: • Disable OCDEN Fuse. • Disable JTAGEN Fuse. • Write one to the JTD bit in MCUCSR. The TDO pin is left floating when the JTAG interface is enabled while the JTAG TAP controller is not shifting data. If the hardware connected to the TDO pin does not pull up the logic level, power consumption will increase. Note that the TDI pin for the next device in the scan chain con- tains a pull-up that avoids this problem. Writing the JTD bit in the MCUCSR register to one or leaving the JTAG fuse unprogrammed disables the JTAG interface. |
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