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ATmega128-16AU Datasheet(PDF) 27 Page - ATMEL Corporation |
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ATmega128-16AU Datasheet(HTML) 27 Page - ATMEL Corporation |
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27 / 386 page  27 2467S–AVR–07/09 ATmega128 Figure 11. External Memory with Sector Select Note: ATmega128 in non ATmega103 compatibility mode: Memory Configuration A is available (Memory Configuration B N/A) ATmega128 in ATmega103 compatibility mode: Memory Configuration B is available (Memory Configuration A N/A) ATmega103 Compatibility Both External Memory Control Registers (XMCRA and XMCRB) are placed in Extended I/O space. In ATmega103 compatibility mode, these registers are not available, and the features selected by these registers are not available. The device is still ATmega103 compatible, as these features did not exist in ATmega103. The limitations in ATmega103 compatibility mode are: • Only two wait-states settings are available (SRW1n = 0b00 and SRW1n = 0b01). • The number of bits that are assigned to address high byte are fixed. • The External Memory section can not be divided into sectors with different wait-state settings. • Bus-keeper is not available. •RD, WR and ALE pins are output only (Port G in ATmega128). Using the External Memory Interface The interface consists of: • AD7:0: Multiplexed low-order address bus and data bus. • A15:8: High-order address bus (configurable number of bits). • ALE: Address latch enable. •RD: Read strobe. •WR: Write strobe. Memory Configuration A 0x0000 0x10FF External Memory (0-60K x 8) 0xFFFF Internal memory SRL[2..0] SRW11 SRW10 SRW01 SRW00 Lower sector Upper sector 0x1100 Memory Configuration B 0x0000 External Memory (0-60K x 8) 0xFFFF Internal memory SRW10 0x0FFF 0x1000 |
Similar Part No. - ATmega128-16AU |
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