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CHAPTER 16 SERIAL INTERFACE CHANNEL 0 (
µ
PD78014Y Subseries)
380
The start condition, slave address, and stop condition signals are output by the master.
The acknowledge signal (ACK) is output by either the master or the slave device (normally by the device which
has received the 8-bit data that was sent).
A serial clock (SCL) is continuously supplied from the master device.
(a) Start condition
When the SDA0 (SDA1) pin level is changed from high to low while the SCL pin is high, this transition is
recognized as the start condition signal. This start condition signal, which is created using the SCL and SDA0
(or SDA1) pins, is output from the master device to slave devices to initiate a serial transfer. See section
16.4.6 Cautions on use of I
2
C bus mode, for details of the start condition output.
The start condition signal is detected by hardware incorporated in slave devices.
Figure 16-38. Start Condition
“H”
SCL
SDA0 (SDA1)
Содержание 78014Y Series
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