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CHAPTER 16 SERIAL INTERFACE CHANNEL 0 (
µ
PD78014Y Subseries)
379
(1) I
2
C bus mode functions
In the I
2
C bus mode, the following functions are available.
(a) Automatic identification of serial data
Slave devices automatically detect and identifies start condition, data, and stop condition signals sent in
series through the serial data bus.
(b) Chip selection by specifying device addresses
The master device can select a specific slave device connected to the I
2
C bus and communicate with it by
sending in advance the address data corresponding to the destination device.
(c) Wake-up function
Interrupt request occurs only if the received address equal to the value of the slave address register (SVA)
during slave operation. Therefore, CPUs other than the selected slave device on the I
2
C bus can perform
independent operations during the serial communication.
(d) Acknowledge signal (ACK) control function
The master device and a slave device send and receive acknowledge signals to confirm that the serial
communication has been executed normally.
(e) Wait signal (WAIT) control function
The slave device controls a wait signal on the bus to inform the master device of the wait status.
(2) I
2
C bus definition
This section describes the format of serial data communications and functions of the signals used in the I
2
C bus
mode.
The transfer timings of the start condition, data, and stop condition signals, which are output onto the signal data
bus of the I
2
C bus, are shown in Figure 16-37.
Figure 16-37. I
2
C Bus Serial Data Transfer Timing
1 to 7
8
9
1 to 7
8
9
1 to 7
8
9
Address
R/W ACK
Start
condition
Data
ACK
Data
ACK
Stop
condition
SCL
SDA0 (SDA1)
Содержание 78014Y Series
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