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ATmega128 датащи(PDF) 77 Page - ATMEL Corporation |
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ATmega128 датащи(HTML) 77 Page - ATMEL Corporation |
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77 / 386 page ![]() 77 2467S–AVR–07/09 ATmega128 Alternate Functions of Port C In ATmega103 compatibility mode, Port C is output only. The ATmega128 is by default shipped in compatibility mode. Thus, if the parts are not programmed before they are put on the PCB, PORTC will be output during first power up, and until the ATmega103 compatibility mode is dis- abled. The Port C has an alternate function as the address high byte for the External Memory Interface. Table 34 and Table 35 relate the alternate functions of Port C to the overriding signals shown in Figure 33 on page 71. Note: 1. XMM = 0 in ATmega103 compatibility mode. Table 33. Port C Pins Alternate Functions Port Pin Alternate Function PC7 A15 PC6 A14 PC5 A13 PC4 A12 PC3 A11 PC2 A10 PC1 A9 PC0 A8 Table 34. Overriding Signals for Alternate Functions in PC7..PC4 Signal Name PC7/A15 PC6/A14 PC5/A13 PC4/A12 PUOE SRE • (XMM(1)<1) SRE • (XMM<2) SRE • (XMM<3) SRE • (XMM<4) PUOV 0 0 0 0 DDOE SRE • (XMM<1) SRE • (XMM<2) SRE • (XMM<3) SRE • (XMM<4) DDOV 1 1 1 1 PVOE SRE • (XMM<1) SRE • (XMM<2) SRE • (XMM<3) SRE • (XMM<4) PVOV A15 A14 A13 A12 DIEOE 0 0 0 0 DIEOV 0 0 0 0 DI – – – – AIO – – – – |
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