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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega128 датащи(PDF) 257 Page - ATMEL Corporation |
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ATmega128 датащи(HTML) 257 Page - ATMEL Corporation |
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257 / 386 page  257 2467S–AVR–07/09 ATmega128 Figure 125. General Port Pin Schematic diagram Boundary-scan and the Two-wire Interface The two Two-wire Interface pins SCL and SDA have one additional control signal in the scan- chain; Two-wire Interface Enable – TWIEN. As shown in Figure 126, the TWIEN signal enables a tri-state buffer with slew-rate control in parallel with the ordinary digital port pins. A general scan cell as shown in Figure 130 is attached to the TWIEN signal. Notes: 1. A separate scan chain for the 50 ns spike filter on the input is not provided. The ordinary scan support for digital port pins suffice for connectivity tests. The only reason for having TWIEN in the scan path, is to be able to disconnect the slew-rate control buffer when doing boundary- scan. 2. Make sure the OC and TWIEN signals are not asserted simultaneously, as this will lead to drive contention. CLK RPx RRx WPx RDx WDx PUD SYNCHRONIZER WDx: WRITE DDRx WPx: WRITE PORTx RRx: READ PORTx REGISTER RPx: READ PORTx PIN PUD: PULLUP DISABLE CLK : I/O CLOCK RDx: READ DDRx D L Q Q RESET RESET Q Q D Q Q D CLR PORTxn Q Q D CLR DDxn PINxn SLEEP SLEEP: SLEEP CONTROL Pxn I/O I/O See Boundary-Scan description for details! PUExn OCxn ODxn IDxn PUExn: PULLUP ENABLE for pin Pxn OCxn: OUTPUT CONTROL for pin Pxn ODxn: OUTPUT DATA to pin Pxn IDxn: INPUT DATA from pin Pxn |
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