NEC V850ES/KE1+ User Manual page 471

ACKD0
0 ACK was not detected.
1 ACK was detected.
Condition for clearing (ACKD0 bit = 0)
• When a stop condition is detected
• At the rising edge of the next byte's first clock
• Cleared by the LREL0 bit = 1 (exit from communications)
• When the IICE0 bit changes from 1 to 0 (operation stop)
• Reset
STD0
0 Start condition was not detected.
1 Start condition was detected. This indicates that the address transfer period is in effect.
Condition for clearing (STD0 bit = 0)
• When a stop condition is detected
• At the rising edge of the next byte's first clock following
address transfer
• Cleared by the LREL0 bit = 1 (exit from communications)
• When the IICE0 bit changes from 1 to 0 (operation stop)
• Reset
SPD0
0 Stop condition was not detected.
1 Stop condition was detected. The master device's communication is terminated and the bus is released.
Condition for clearing (SPD0 bit = 0)
• At the rising edge of the address transfer byte's first
clock following setting of this bit and detection of a start
condition
• When the IICE0 bit changes from 1 to 0 (operation stop)
• Reset
2
CHAPTER 16 I C BUS
Detection of ACK
Condition for setting (ACKD0 bit = 1)
• After the SDA0 pin is set to low level at the rising edge of
the SCL0 pin's ninth clock
Detection of start condition
Condition for setting (STD0 bit = 1)
• When a start condition is detected
Detection of stop condition
Condition for setting (SPD0 bit = 1)
• When a stop condition is detected
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