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CHAPTER 16 SERIAL INTERFACE CHANNEL 0 (
µ
PD78014Y Subseries)
361
Table 16-5. Various Signals in SBI Mode (1/2)
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) before
(2) Execution of
serial transfer start and
instruction data
after completion of serial
write SIO0
transfer
(transfer start
instruction)
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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