CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U13850EJ4V0UM
269
Figure 10-16. Pin Configuration Diagram
V
DD
SCL
SDA
SCL
SDA
V
DD
Clock output
Master device
(Clock input)
Data output
Data input
(Clock output)
Clock input
Data output
Data input
Slave device
10.3.4 I
2
C bus definitions and control methods
The following section describes the I
2
C bus’s serial data communication format and the signals used by the I
2
C
bus. The transfer timing for the “start condition”, “data”, and “stop condition” output via the I
2
C bus’s serial data bus
is shown below.
Figure 10-17. I
2
C Bus’s Serial Data Transfer Timing
1 to 7
8
9
1 to 7
8
9
1 to 7
8
9
SCL
SDA
Start
condition
Address
R/W
ACK
Data
Data
Stop
condition
ACK
ACK
The master device outputs the start condition, slave address, and stop condition.
The acknowledge signal (ACK) can be output by either the master or slave device (normally, it is output by the
device that receives 8-bit data).
The serial clock (SCLn) is continuously output by the master device. However, in the slave device, the SCLn’s
low-level period can be extended and a wait can be inserted (n = 0, 1).
Содержание MPD703030A
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