29-27
MB86R02 ‘Jade-D’ Hardware Manual V1.64
29.8.6 Acknowledge/Negative acknowledge
The nineth bit of data indicates an acknowledge (ACK)/negative acknowledge (NACK). A status of "0" is
acknowledge and "1" is a negative acknowledge.
The reception side transmits a acknowledge/negative acknowledge to the transmitter and this is stored
in the LRB bit on data reception.
If an acknowledge is not received from the master reception side during slave transmission (when a
negative acknowledge is received), the state becomes TRX = "0" and the mode changes to slave
reception mode. As a result, the master is able to generate a stop condition when the slave opens the
SCL line.
I2C_SDAx
I2C_SCLx
SDA output
Macro A (transmission)
Macro B (reception)
Reception side returns
ACK/NACK to transmission side
Transmission side opens bus for
ACK/NACK output on reception
side
1
2
3
4
5
6
7
8
9
ACK
ACK
SCL output
SDA output
SCL output
Master generates
clock
Summary of Contents for MB86R02
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