
CHAPTER  18   I
2
C  BUS
552
User
’
s Manual  U15862EJ3V0UD
(2/4)
WRELn
Wait cancellation control
0
Does not cancel wait
1
Cancels wait.  This setting is automatically cleared after wait is canceled.
Condition for clearing (WRELn = 0)
Note
Condition for setting (WRELn = 1)
 Automatically cleared after execution
 When RESET is input
 Set by instruction
SPIEn
Enable/disable generation of interrupt request when stop condition is detected
0
Disable
1
Enable
Condition for clearing (SPIEn = 0)
Note
Condition for setting (SPIEn = 1)
 Cleared by instruction
 When RESET is input
 Set by instruction
WTIMn
Control of wait and interrupt request generation
0
Interrupt request is generated at the eighth clock
’
s falling edge.
Master mode: After output of eight clocks, clock output is set to low level and wait is set.
Slave mode: After input of eight clocks, the clock is set to low level and wait is set for master device.
1
Interrupt request is generated at the ninth clock
’
s falling edge.
Master mode: After output of nine clocks, clock output is set to low level and wait is set.
Slave mode: After input of nine clocks, the clock is set to low level and wait is set for master device.
This bit
’
s setting is invalid during an address transfer and is valid as the transfer is completed.  When in master mode,
a wait is inserted at the falling edge of the ninth clock during address transfers.  For a slave device that has received a
local address, a wait is inserted at the falling edge of the ninth clock after an ACK signal is issued.  When the slave
device has received an extension code, a wait is inserted at the falling edge of the eighth clock.
Condition for clearing (WTIMn = 0)
Note
Condition for setting (WTIMn = 1)
 Cleared by instruction
 When RESET is input
 Set by instruction
Note
 This flag
’
s signal is invalid when IICEn = 0.