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ATmega128
Figure 11. External Memory with Sector Select
Memory Configuration A
0x0000
Internal memory
Memory Configuration B
0x0000
Internal memory
0x0FFF
0x1000
0x10FF
0x1100
Lower sector
SRW01
SRW00
SRL[2..0]
SRW10
External Memory
(0-60K x 8)
Upper sector
SRW11
SRW10
0xFFFF
External Memory
(0-60K x 8)
0xFFFF
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 (SR W 1n = 0b00 and SR W 1n = 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, W R and ALE pins are output only (Port G in ATmega128).
Using the External
The interface consists of:
Memory Interface
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?
?
?
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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.
W R: W rite strobe.
26
2467X–AVR–06/11
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