RL78/F13, F14 CHAPTER 16 SERIAL INTERFACE IICA
R01UH0368EJ0210 Rev.2.10 1029
Dec 10, 2015
Figure 16-7. Format of IICA Status Register 0 (IICS0) (2/3)
EXC0 Detection of extension code reception
0 Extension code was not received.
1 Extension code was received.
Condition for clearing (EXC0 = 0) Condition for setting (EXC0 = 1)
When a start condition is detected
When a stop condition is detected
Cleared by LREL0 = 1 (exit from communications)
When the IICE0 bit changes from 1 to 0 (operation
stop)
Reset
When the higher four bits of the received address
data is either 0000 or 1111 (set at the rising edge of
the eighth clock).
COI0 Detection of matching addresses
0 Addresses do not match.
1 Addresses match.
Condition for clearing (COI0 = 0) Condition for setting (COI0 = 1)
When a start condition is detected
When a stop condition is detected
Cleared by LREL0 = 1 (exit from communications)
When the IICE0 bit changes from 1 to 0 (operation
stop)
Reset
When the received address matches the local
address (slave address register 0 (SVA0))
(set at the rising edge of the eighth clock).
TRC0 Detection of transmit/receive status
0 Receive status (other than transmit status). The SDAA0 line is set for high impedance.
1 Transmit status. The value in the SO0 latch is enabled for output to the SDAA0 line (valid starting at
the falling edge of the first byte’s ninth clock).
Condition for clearing (TRC0 = 0) Condition for setting (TRC0 = 1)
<Both master and slave>
When a stop condition is detected
Cleared by LREL0 = 1 (exit from communications)
When the IICE0 bit changes from 1 to 0 (operation
stop)
Cleared by WREL0 = 1
Note
(wait cancel)
When the ALD0 bit changes from 0 to 1 (arbitration
loss)
Reset
When not used for communication (MSTS0, EXC0, COI0 =
0)
<Master>
When 1 is output to the LSB (transfer direction
specification bit) of the first byte
<Slave>
When a start condition is detected
When 0 is input to the LSB (transfer direction
specification bit) of the first byte.
<Master>
When a start condition is generated
When 0 (master transmission) is output to the LSB
(transfer direction specification bit) of the first byte
(during address transfer).
<Slave>
When 1 (slave transmission) is input to the LSB
(transfer direction specification bit) of the first byte
(during address transfer) from the master.
Note When bit 3 (TRC0) of the IICA status register 0 (IICS0) is set to 1 (transmission status), bit 5 (WREL0)
of IICA control register 00 (IICCTL00) is set to 1 during the ninth clock and wait is canceled, after
which the TRC0 bit is cleared (reception status) and the SDAA0 line is set to high impedance.
Release the wait performed while the TRC0 bit is 1 (transmission status) by writing to the IICA shift
register 0.
Remark LREL0: Bit 6 of IICA control register 00 (IICCTL00)
IICE0: Bit 7 of IICA control register 00 (IICCTL00)
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