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Examples of I C transfers are shown in Figure 15.5 (p. 147) , Figure 15.6 (p. 147), and Figure 15.7 (p.
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after the current, it can start a new transfer directly by transmitting a repeated START condition (Sr)
instead of a STOP followed by a START.
2
147) . The identifiers used are:
?
?
?
?
?
?
?
?
ADDR - Address
DATA - Data
S - Start bit
Sr - Repeated start bit
P - Stop bit
W/R - Read(1)/Write(0)
A - ACK
N - NACK
Figure 15.5. I C Single Byte Write to Slave
2
S
ADDR
W A
DATA
A
P
Figure 15.6. I C Double Byte Read from Slave
2
S
ADDR
R
A
DATA
A
DATA
N
P
Figure 15.7. I C Single Byte Write, then Repeated Start and Single Byte Read
2
S
ADDR
W A
DATA
A Sr
ADDR
R
A
DATA
N
P
I C supports both 7-bit and 10-bit addresses. When using 7-bit addresses, the first byte transmitted after
include a General Call address which can be used to broadcast a message to all slaves on the I C-bus.
Table 15.1. I C Reserved I C Addresses
15.3.1.3 Addresses
2
the START-condition contains the address of the slave the master wants to contact. In the 7-bit address
space, several addresses are reserved. These addresses are summarized in Table 15.1 (p. 147) , and
2
2 2
I C Address
2
0000-000
0000-000
0000-001
0000-010
0000-011
0000-1XX
1111-1XX
1111-0XX
R/W
0
1
X
X
X
X
X
X
Description
General Call address
START byte
Reserved for the C-Bus format
Reserved for a different bus format
Reserved for future purposes
Reserved for future purposes
Reserved for future purposes
10 Bit slave addressing mode
15.3.1.4 10-bit Addressing
To address a slave using a 10-bit address, two bytes are required to specify the address instead of
one. The seven first bits of the first byte must then be 1111 0XX, where XX are the two most significant
bits of the 10-bit address. As with 7-bit addresses, the eight bit of the first byte determines whether the
master wishes to read from or write to the slave. The second byte contains the eight least significant
bits of the slave address.
2011-04-12 - d0001_Rev1.10
147
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