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ATMEGA16 데이터시트(PDF) 228 Page - ATMEL Corporation |
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ATMEGA16 데이터시트(HTML) 228 Page - ATMEL Corporation |
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228 / 315 page ![]() 228 ATmega16(L) 2466E–AVR–10/02 Figure 118. Additional Scan Signal for the Two-wire Interface Scanning the RESET Pin The RESET pin accepts 5V active low logic for standard reset operation, and 12V active high logic for High Voltage Parallel Programming. An observe-only cell as shown in Fig- ure 119 is inserted both for the 5V reset signal; RSTT, and the 12V reset signal; RSTHV. Figure 119. Observe-only Cell Scanning the Clock Pins The AVR devices have many clock options selectable by fuses. These are: Internal RC Oscillator, External RC, External Clock, (High Frequency) Crystal Oscillator, Low Fre- quency Crystal Oscillator, and Ceramic Resonator. Figure 120 shows how each Oscillator with external connection is supported in the scan chain. The Enable signal is supported with a general boundary-scan cell, while the Oscillator/Clock output is attached to an observe-only cell. In addition to the main clock, the Timer Oscillator is scanned in the same way. The output from the internal RC Oscil- lator is not scanned, as this Oscillator does not have external connections. Pxn PUExn ODxn IDxn TWIEN OCxn Slew-rate Limited SRC 0 1 DQ From Previous Cell ClockDR ShiftDR To Next Cell From System Pin To System Logic FF1 |
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