at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 489

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

32.5.5.2
Figure 32-12. Internal Address Usage
489
AT91SAM9263 Preliminary
10-bit Slave Addressing
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For a slave address higher than 7 bits, the user must configure the address size (IADRSZ) and
set the other slave address bits in the internal address register (TWI_IADR). The two remaining
Internal address bytes, IADR[15:8] and IADR[23:16] can be used the same as in 7-bit Slave
Addressing.
Example: Address a 10-bit device (10-bit device address is b1 b2 b3 b4 b5 b6 b7 b8 b9 b10)
Figure 32-12
the use of internal addresses to access the device.
Address
1. Program IADRSZ = 1,
2. Program DADR with 1 1 1 1 0 b1 b2 (b1 is the MSB of the 10-bit address, b2, etc.)
3. Program TWI_IADR with b3 b4 b5 b6 b7 b8 b9 b10 (b10 is the LSB of the 10-bit
Device
address)
0
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E
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/
below shows a byte write to an Atmel AT24LC512 EEPROM. This demonstrates
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WORD ADDRESS
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FIRST
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K
WORD ADDRESS
SECOND
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B
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K
DATA
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O
P
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6249D–ATARM–20-Dec-07