AT91SAM9G10-EK Atmel, AT91SAM9G10-EK Datasheet - Page 383
AT91SAM9G10-EK
Manufacturer Part Number
AT91SAM9G10-EK
Description
KIT DEV FOR SAM9G10 ARM
Manufacturer
Atmel
Type
MCUr
Specifications of AT91SAM9G10-EK
Contents
Board, Cables, Power Supply
Silicon Manufacturer
Atmel
Core Architecture
AVR
Kit Contents
Board
Svhc
No SVHC (15-Dec-2010)
Mcu Supported Families
AT91SAM9G10, ARM926EJ-S
Tool / Board Applications
Microcontroller
Rohs Compliant
Yes
For Use With/related Products
*
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Figure 31-11. Master Write with One, Two or Three Bytes Internal Address and One Data Byte
Figure 31-12. Master Read with One, Two or Three Bytes Internal Address and One Data Byte
31.7.6.2
Figure 31-13. Internal Address Usage
383
TWD
TWD
TWD
TWD
TWD
TWD
Three bytes internal address
Two bytes internal address
One byte internal address
Three bytes internal address
Two bytes internal address
One byte internal address
S
S
S
AT91SAM9G10
S
S
S
10-bit Slave Addressing
DADR
DADR
DADR
DADR
DADR
DADR
W
W
W
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 31-13
the use of internal addresses to access the device.
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
W
W
W
S
T
A
R
T
A
A
A
M
S
B
address)
Address
Device
IADR(23:16)
A
A
A
IADR(15:8)
IADR(7:0)
0
below shows a byte write to an Atmel AT24LC512 EEPROM. This demonstrates
IADR(23:16)
IADR(15:8)
S
B
IADR(7:0)
L
W
W
R
E
T
R
I
/
A
C
K
WORD ADDRESS
A
A
A
M
S
B
FIRST
IADR(15:8)
Sr
IADR(7:0)
A
A
A
DADR
A
C
K
IADR(15:8)
IADR(7:0)
WORD ADDRESS
DATA
SECOND
R
A
A
Sr
IADR(7:0)
A
S
B
A
A
A
L
A
C
K
DADR
IADR(7:0)
P
DATA
DATA
DATA
A
Sr
R
A
C
K
O
S
T
P
A
A
N
A
DADR
DATA
P
P
DATA
DATA
6462A–ATARM–03-Jun-09
R
N
P
A
N
A
P
P
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