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24VL014H
5.0
DEVICE ADDRESSING
FIGURE 5-1:
CONTROL BYTE FORMAT
A control byte is the first byte received following the
Start condition from the master device (Figure 5-1).
Read/Write Bit
The control byte consists of a four-bit control code; for
the 24VL014H this is set as ‘ 1010 ’ binary for read and
write operations. The next three bits of the control byte
Control Code
Chip Select
Bits
are the Chip Select bits (A2, A1, A0). The Chip Select
S
1
0
1
0
A2
A1
A0 R/W ACK
bits allow the use of up to eight 24VL014H devices on
the same bus and are used to select which device is
accessed. The Chip Select bits in the control byte must
Slave Address
correspond to the logic levels on the corresponding A2,
A1 and A0 pins for the device to respond. These bits
are in effect the three Most Significant bits of the word
address.
Start Bit
5.1
Acknowledge Bit
Contiguous Addressing Across
The last bit of the control byte defines the operation to
be performed. When set to a ‘ 1 ’, a read operation is
selected. When set to a ‘ 0 ’, a write operation is
selected. Following the Start condition, the 24VL014H
monitors the SDA bus, checking the control byte being
transmitted. Upon receiving a ‘ 1010 ’ code and
appropriate Chip Select bits, the slave device
outputs an Acknowledge signal on the SDA line.
Depending on the state of the R/W bit, the 24VL014H
will select a read or write operation.
DS22116A-page 8
Multiple Devices
The Chip Select bits A2, A1 and A0 can be used to
expand the contiguous address space for up to 8K bits
by adding up to eight 24VL014H devices on the same
bus. In this case, software can use A0 of the control
byte as address bit A7, A1 as address bit A8, and A2
as address bit A9. It is not possible to sequentially read
across device boundaries.
? 2008 Microchip Technology Inc.
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