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CHAPTER 16 SERIAL INTERFACE CHANNEL 0 (
µ
PD78014Y Subseries)
390
(4) Various signals
A list of signals in the I
2
C bus mode is given in Table 16-6.
Table 16-6. Signals in the I
2
C Bus Mode
Signal name
Signaled by
Definition
Signaled when
Affected flag(s)
Function
Start condition Master
SDA0 (SDA1) falling edge
CMDT is set.
CMDD is set.
Indicates that serial
when SCL is high
Note 1
communication starts and
subsequent data are
address data.
Stop condition Master
SDA0 (SDA1) rising edge
RELT is set.
RELD is set and
Indicates end of serial
when SCL is high
Note 1
CMDD is cleared
transmission.
Acknowledge
Master or
Low level of SDA0 (SDA1)
• ACKE = 1.
ACKD is set.
Indicates completion of
signal (ACK)
slave
pin during one SCL clock
• ACKT is set.
reception of 1 byte.
cycle after serial reception
Wait (WAIT)
Slave
Low-level signal output
WAT1,
—
Indicates state in which
to SCL
WAT0 = 1
×
.
serial reception is not
possible.
Serial Clock
Master
Synchronization clock for
Execution of data
CSIIF0 is
Serial communication
(SCL)
output of various signals
write instruction
set.
Note 3
synchronization signal.
Address
Master
7-bit data synchronized with
to SIO0 when
Indicates address value
(A6 to A0)
SCL immediately after start
CSIE0 = 1
for specification of slave
condition signal
(instruction of
on serial bus.
Transfer
Master
1-bit data output in synchro- serial transfer
Indicates whether data
direction
nization with SCL after
start)
Note 2
transmission or reception
(R/W)
address output
is to be performed.
Data
Master or
8-bit data synchronized with
Contains data actually to
(D7 to D0)
slave
SCL, not immediately after
be sent.
start condition
Notes
1. The level of the serial clock can be controlled by bit 3 (CLC) of the interrupt timing specification register
(SINT).
2. In the wait state, the serial transfer operation will be started after the wait state is released.
3. If the 8-clock wait is selected when WUP = 0, CSIIF0 is set at the rising edge of the 8th clock cycle of
SCL. If the 9-clock wait is selected when WUP = 0, CSIIF0 is set at the rising edge of the 9th clock cycle
of SCL.
If WUP = 1, CSIIF0 is set only when an address is received and the address matches the slave address
register (SVA) value.
Содержание 78014Y Series
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