NEC ?PD703302, Руководство пользователя

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CHAPTER 16 I
2
C BUS
User’s Manual U16896EJ2V0UD
471
(3/3)
ACKD0 Detection of ACK
0 ACK was not detected.
1 ACK was detected.
Condition for clearing (ACKD0 bit = 0) Condition for setting (ACKD0 bit = 1)
•
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
•
After the SDA0 pin is set to low level at the rising edge of
the SCL0 pin’s ninth clock
STD0 Detection of start condition
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) Condition for setting (STD0 bit = 1)
•
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
•
When a start condition is detected
SPD0 Detection of stop condition
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) Condition for setting (SPD0 bit = 1)
•
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
•
When a stop condition is detected