2 twi master mode register – Rainbow Electronics AT91CAP9S250A User Manual
Page 513
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513
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
34.10.2
TWI Master Mode Register
Name: TWI_MMR
Access: Read/Write
Reset Value: 0x00000000
• IADRSZ: Internal Device Address Size
• MREAD: Master Read Direction
0 = Master write direction.
1 = Master read direction.
• DADR: Device Address
The device address is used to access slave devices in read or write mode. Those bits are only used in Master mode.
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
DADR
15
14
13
12
11
10
9
8
–
–
–
MREAD
–
–
IADRSZ
7
6
5
4
3
2
1
0
–
–
–
–
–
–
–
–
IADRSZ[9:8]
0
0
No internal device address
0
1
One-byte internal device address
1
0
Two-byte internal device address
1
1
Three-byte internal device address
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