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CHAPTER 15 SERIAL INTERFACE CHANNEL 0 (
µ
PD78014 Subseries)
300
Signal Name
Output
Definition
Timing Chart
Output Condition
Effects on Flag
Meaning of Signal
Device
Bus release
Master
SB0 (SB1) rising edge
• RELT set
• RELD set
CMD signal is output to
signal (REL)
when SCK0 = 1
• CMDD clear
indicate that transmit
data is an address.
Command signal
Master
SB0 (SB1) falling edge
• CMDT set
• CMDD set
i) Transmit data is an
(CMD)
when SCK0 = 1
address after REL
signal output.
ii) REL signal is not
output, and transmit
data is a command.
Acknowledge
Master/
Low-level signal to be
<1> ACKE = 1
• ACKD set
Completion of reception
signal (ACK)
slave
output to SB0 (SB1)
<2> ACKT set
during one-clock period
of SCK0 after completion
of serial reception
Busy signal
Slave
[Synchronous BUSY signal]
• BSYE = 1
—
Serial receive disable
(BUSY)
Low-level signal to be
because of processing
output to SB0 (SB1)
following Acknowledge
signal
Ready signal
Slave
High-level signal to be
<1> BSYE = 0
—
Serial receive enable
(READY)
output to SB0 (SB1)
<2> Execution
before serial transfer
of instruction
start and after completion
data write
of serial transfer
SIO0 (trans
start
instruction)
Table 15-4. Various Signals in SBI Mode (1/2)
SCK0
“H”
SB0 (SB1)
“H”
SB0 (SB1)
SCK0
SB0 (SB1)
[Synchronous BUSY output]
SB0 (SB1)
9
D0
READY
READY
SCK0
ACK
BUSY
ACK
BUSY
D0
Содержание 78014Y Series
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