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ATMEGA8515 Datasheet(PDF) 30 Page - ATMEL Corporation

Part # ATMEGA8515
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
Download  257 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA8515 Datasheet(HTML) 30 Page - ATMEL Corporation

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ATmega8515(L)
2512K–AVR–01/10
SRAM address space is configured as one sector, the wait states are configured by the
SRW11 and SRW10 bits.
• Bit 1 and Bit 6 MCUCR – SRW11, SRW10: Wait State Select Bits for Upper
Sector
The SRW11 and SRW10 bits control the number of wait states for the upper sector of
the External Memory address space, see Table 3.
• Bit 3..2 – SRW01, SRW00: Wait State Select Bits for Lower Sector
The SRW01 and SRW00 bits control the number of wait states for the lower sector of
the External Memory address space, see Table 3.
Note:
1. n = 0 or 1 (lower/upper sector).
For further details of the timing and wait states of the External Memory Interface, see
Figure 13 to Figure 16 how the setting of the SRW bits affects the timing.
Table 2. Sector Limits with Different Settings of SRL2..0
SRL2
SRL1
SRL0
Sector Limits
00
0
Lower sector = N/A
Upper sector = 0x0260 - 0xFFFF
00
1
Lower sector = 0x0260 - 0x1FFF
Upper sector = 0x2000 - 0xFFFF
01
0
Lower sector = 0x0260 - 0x3FFF
Upper sector = 0x4000 - 0xFFFF
01
1
Lower sector = 0x0260 - 0x5FFF
Upper sector = 0x6000 - 0xFFFF
10
0
Lower sector = 0x0260 - 0x7FFF
Upper sector = 0x8000 - 0xFFFF
10
1
Lower sector = 0x0260 - 0x9FFF
Upper sector = 0xA000 - 0xFFFF
11
0
Lower sector = 0x0260 - 0xBFFF
Upper sector = 0xC000 - 0xFFFF
11
1
Lower sector = 0x0260 - 0xDFFF
Upper sector = 0xE000 - 0xFFFF
Table 3. Wait States(1)
SRWn1
SRWn0
Wait States
0
0
No wait states.
0
1
Wait one cycle during read/write strobe.
1
0
Wait two cycles during read/write strobe.
11
Wait two cycles during read/write and wait one cycle before driving out
new address.


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