CHAPTER 13 SERIAL INTERFACE CHANNEL 0
240
User’s Manual U11302EJ4V0UM
Table 13-4. Signals in SBI Mode (1/2)
Bus release
signal
(REL)
Command
signal
(CMD)
Master
Master
SB0/SB1 rising edge when
SCK0 = 1
SB0/SB1 falling edge
when SCK0 = 1
•
RELT set
•
CMDT set
•
RELD set
•
CMDD clear
•
CMDD set
[Synchronous BUSY signal]
Low-level signal output to
SB0/SB1 following
acknowledge signal
Low-level signal output to
SB0/SB1 during one-clock
period of SCK0 after
completion of serial
reception
Master/
slave
Acknowledge
signal
(ACK)
Slave
Busy signal
(BUSY)
•
BSYE = 1
[1]
ACKE = 1
[2]
ACKT set
•
ACKD set
CMD signal is
output to indicate
that transmit data is
an address.
Completion of
reception
Serial receive
disabled because of
processing
Serial receive
enabled
i)
Transmit data is
an address after
REL signal output.
ii)
REL si
gnal is not
output and
transmit data is a
command.
Signal Name
Output
Device
Definition
High-level signal output to
SB0/SB1 before serial
transfer start and after
completion of serial
transfer
Slave
Ready signal
(READY)
Timing Chart
Output Condition
Effect on Flag
Meaning of Signal
—
—
[Synchronous BUSY output]
D0
READY
SB0/SB1
D0
READY
SB0/SB1
SCK0
ACK
BUSY
BUSY
ACK
9
[1]
BSYE = 0
[2]
Execution of
instruction data
write to SIO0
(transfer start
instruction)
SCK0
“
H
”
SB0/SB1
SCK0
“
H
”
SB0/SB1
Содержание mPD780204
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