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CHAPTER 16 SERIAL INTERFACE CHANNEL 0 (
µ
PD78014Y Subseries)
352
(f)
Busy signal (BUSY), Ready signal (READY)
The busy signal informs the master that the slave is busy transmitting/receiving data.
The ready signal informs the master that the slave is ready to transmit/receive data.
Figure 16-21. Busy Signal, Ready Signal
Remark
The broken line indicates the ready state.
In the SBI mode, the slave informs the master of the busy state by setting SB0 (SB1) line to low level.
The busy signal is output following the acknowledge signal the slave outputs. The busy signal is set/cleared
synchronously with the falling edge of SCK0. The master terminates automatically to output the serial clock
SCK0 when the busy signal is cleared.
The master can start subsequent transmissions when the busy signal is cleared and changes to the ready
state.
Caution In the SBI mode, the BUSY signal is output until the falling of the next serial clock after
the BUSY release indication. If WUP = 1 is set by mistake during this period, BUSY will
not be released. Thus, after releasing BUSY, be sure to check that the SB0 (SB1) has
become high level before setting WUP = 1.
(3) Register setting
The SBI mode is set with the serial operating mode register 0 (CSIM0), the serial bus interface control register
(SBIC), and the interrupt timing specification register (SINT).
(a) Serial operating mode register 0 (CSIM0)
CSIM0 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets CSIM0 to 00H.
SCK0
SB0 (SB1)
ACK
BUSY
READY
8
9
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...