UPC1854A View Datasheet(PDF) - NEC => Renesas Technology
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UPC1854A Datasheet PDF : 48 Pages
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3.2 Data Transfer Format
An example of data transfer in the write mode is shown in Figure 3-4.
Figure 3-4. Data Transfer Example in Write Mode
µPC1854A
SDA
D6
D5 D4
D3
D2
D1
D0
Write
mode
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
SCL
123456789 123456789 123456789
Start
Slave address
Read/
Write Acknowledge
Subaddress
Acknow-
ledge
data
Acknow- Stop
ledge
Data consists of 8-bit units. This 8-bit data must always be followed by an acknowledge bit. Data transfer must
be done on an MSB-first basis.
The first byte after a start condition specifies the slave address. The slave address consists of 7 bits.
Table 3-1 shows the slave addresses of the µPC1854A. These slave addresses are registered by Philips.
Table 3-1. Slave Addresses of µPC1854A
Slave address
D6
D5
D4
D3
D2
D1
D0
Read/Write
Mode
Write
1
0
0
0
1
1
1
0
Read
1
0
0
0
1
1
1
1
The bit following the slave address is the read/write bit specifying the direction of the data to be transferred.
During the read operation, data is transferred from the µPC1854A to the master CPU. During the write opera-
tion, data is transferred from the master CPU to the µPC1854A. “0” and “1” are written to the Read/Write bit during
the Write and Read modes, respectively.
The byte following the slave address is the subaddress of the µPC1854A in the write mode.
The µPC1854A has seven subaddresses, SA0 to SA6, which are made up of 8 bits. Following the subaddress
byte is the data to be set to the subaddress.
20
Data Sheet S12816EJ3V0DS00
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