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CHAPTER 16 SERIAL INTERFACE CHANNEL 0 (
µ
PD78014Y Subseries)
404
(2) Restriction on slave device operation in the I
2
C bus mode
Applied devices:
µ
PD78011BY, 78012BY, 78013Y, 78014Y, 78P014Y
IE-78014-R-EM
Description:
If all of the following conditions are satisfied, all slave devices on the transfer line cannot
transmit data.
• The
µ
PD78014Y subseries device is used as one of the slave devices in the I
2
C bus mode.
• The master device outputs the stop condition signal when it terminates transmission to the
µ
PD78014Y Subseries device (i.e. slave reception).
• Following the master transmission operation to the
µ
PD78014Y Subseries device (i.e. slave
reception), the master reception (i.e. slave transmission) request is sent to any unit.
In the
µ
PD78014Y Subseries, communication is started by writing data in serial I/O shift
register 0 (SIO0). In data reception operation, write FFH in SIO0 to be high-impedance state
the N-ch open-drain output.
After writing FFH into SIO0 of the
µ
PD78014Y Subseries device, if the master device drives
the SCL line to high level to output the start condition or stop condition signals, then SIO0
shift operation is carried out in the
µ
PD78014Y Subseries device (slave device). As a result,
written FFH is shifted and LSB of SIO0 becomes equal to the level of SDA0 (SDA1).
If the master device drives SCL to high level after driving SDA0 (SDA1) to low level to output
a stop condition signal as shown in the following figure, then the contents of SIO0 change
to FEH (LSB = 0) according to the above-mentioned operation. Therefore the LSB of next
reception data must be “0”.
The reception data which follows the start condition signal is defined as the slave address
field, and the LSB of the slave address field is defined as the transfer direction specification
bit. The LSB of the slave address field must be “0”, so that it indicates the slave reception
operation regardless of the data output from the master device.
Transfer line
Slave device operation
SCL
SDA0 (SDA1)
Software
operation
SIO0
Stop condition
Start condition
This bit must be “0”.
SIO0
←
FFH
FEH
Change to FEH at this point
Summary of Contents for 78014Y Series
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Page 62: ...www DataSheet4U com CHAPTER 2 OUTLINE PD78014Y Subseries 62 MEMO...
Page 78: ...www DataSheet4U com CHAPTER 3 PIN FUNCTION PD78014 Subseries 78 MEMO...
Page 94: ...www DataSheet4U com CHAPTER 4 PIN FUNCTION PD78014Y Subseries 94 MEMO...
Page 170: ...www DataSheet4U com CHAPTER 7 CLOCK GENERATOR 170 MEMO...
Page 222: ...www DataSheet4U com CHAPTER 9 8 BIT TIMER EVENT COUNTER 222 MEMO...
Page 230: ...www DataSheet4U com CHAPTER 10 WATCH TIMER 230 MEMO...
Page 262: ...www DataSheet4U com CHAPTER 14 A D CONVERTER 262 MEMO...
Page 318: ...www DataSheet4U com CHAPTER 15 SERIAL INTERFACE CHANNEL 0 PD78014 Subseries 318 MEMO...
Page 408: ...www DataSheet4U com CHAPTER 16 SERIAL INTERFACE CHANNEL 0 PD78014Y Subseries 408 MEMO...
Page 446: ...www DataSheet4U com CHAPTER 17 SERIAL INTERFACE CHANNEL 1 446 MEMO...
Page 472: ...www DataSheet4U com CHAPTER 18 INTERRUPT FUNCTIONS AND TEST FUNCTION 472 MEMO...
Page 502: ...www DataSheet4U com CHAPTER 22 PD78P014 78P014Y 502 MEMO...
Page 520: ...www DataSheet4U com CHAPTER 23 INSTRUCTION SET 520 MEMO...