Operation; Communication Data Format - Renesas RX100 Series User Manual

RX13T Group
24.3

Operation

24.3.1

Communication Data Format

2
The I C-bus format consists of 8-bit data and 1-bit acknowledge. The first byte following a start condition or restart
condition is an address byte used to specify a slave device with which the master device communicates. The specified
slave is valid until a new slave is specified or a stop condition is issued.
Figure 24.3 shows the I
[7-bit address format]
S SLA (7 bits)
1 7
[10-bit address format]
S 11110b+SLA(2 bits)
1 7
S 11110b+SLA(2 bits)
1 7
n: Number of transmit DATA bytes
2
Figure 24.3 I C-bus Format
SCL0
1 to 7
SDA0
S SLA
2
Figure 24.4 I C-bus Timing (SLA = 7 Bits)
S: Start condition. The master device drives the SDA0 line low from high level while the SCL0 line is at a high level.
SLA: Slave address, by which the master device selects a slave device.
R/W#: Indicates the direction of data transfer: from the slave device to the master device when R/W is 1, or from the master device to
the slave device when R/W is 0.
A: Acknowledge. The receive device drives the SDA0 line low. (In master transmit mode, the slave device returns acknowledge.
In master receive mode, the master device returns acknowledge.)
A#: Not Acknowledge. The receive device drives the SDA0 line high.
Sr: Restart condition. The master device drives the SDA0 line low from the high level after the setup time has elapsed with the
SCL0 line at the high level.
DATA: Transmitted or received data
P: Stop condition. The master device drives the SDA0 line high from low level while the SCL0 line is at a high level.
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
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C-bus format, and Figure 24.4 shows the I
R/W# A DATA (8 bits)
1 1 8
n (n = 1 or more)
W# A SLA (8 bits)
1 1 8
W# A SLA (8 bits)
1 1 8
8 9
R/W# A
2
C-bus timing.
A A/A# P
1 1 1
A DATA (8 bits) A
1 8 1
n (n = 1 or more)
A Sr 11110b+SLA(2 bits) R
1 1 7 1
1 to 7 8 9
Data A
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24. I C-bus Interface (RIICa)
A/A# P
1 1
A DATA (8 bits) A
1 8 1
n (n = 1 or more)
1 to 7 8 9
Data
Page 756 of 1041
A/A# P
1 1
A P