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ATMEGA16 データシート(PDF) 59 Page - ATMEL Corporation |
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ATMEGA16 データシート(HTML) 59 Page - ATMEL Corporation |
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59 / 315 page  59 ATmega16(L) 2466E–AVR–10/02 • SDA – Port C, Bit 1 SDA, Two-wire Serial Interface Data: When the TWEN bit in TWCR is set (one) to enable the Two-wire Serial Interface, pin PC1 is disconnected from the port and becomes the Serial Data I/O pin for the Two-wire Serial Interface. In this mode, there is a spike filter on the pin to suppress spikes shorter than 50 ns on the input signal, and the pin is driven by an open drain driver with slew-rate limitation. When this pin is used by the Two-wire Serial Interface, the pull-up can still be controlled by the PORTC1 bit. • SCL – Port C, Bit 0 SCL, Two-wire Serial Interface Clock: When the TWEN bit in TWCR is set (one) to enable the Two-wire Serial Interface, pin PC0 is disconnected from the port and becomes the Serial Clock I/O pin for the Two-wire Serial Interface. In this mode, there is a spike filter on the pin to suppress spikes shorter than 50 ns on the input signal, and the pin is driven by an open drain driver with slew-rate limitation. When this pin is used by the Two-wire Serial Interface, the pull-up can still be controlled by the PORTC0 bit. Table 29 and Table 30 relate the alternate functions of Port C to the overriding signals shown in Figure 26 on page 52. Table 29. Overriding Signals for Alternate Functions in PC7..PC4 Signal Name PC7/TOSC2 PC6/TOSC1 PC5/TDI PC4/TDO PUOE AS2 AS2 JTAGEN JTAGEN PUOV 0 0 1 0 DDOE AS2 AS2 JTAGEN JTAGEN DDOV 0 0 0 SHIFT_IR + SHIFT_DR PVOE 0 0 0 JTAGEN PVOV 0 0 0 TDO DIEOE AS2 AS2 JTAGEN JTAGEN DIEOV 0 0 0 0 DI – – – – AIO T/C2 OSC OUTPUT T/C2 OSC INPUT TDI – |
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