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17.6
Bit Synchronous Circuit
In master mode,
•
When the SCL is driven low by the slave device
•
When the rising speed of the SCL is lower by the load of the SCL line (load capacitance or
pull-up resistance)
This module has a possibility that the high level period may be short in the two states described
above. Therefore it monitors the SCL and communicates by bits with synchronization.
Figure 17.18 shows the timing of the bit synchronous circuit and table 17.4 shows the time when
SCL output changes from low to Hi-Z then the SCL is monitored.
SCL
VIH
Reference clock
for SCL monitor
timing
Internal SCL
Figure 17.18 Timing of Bit Synchronous Circuit
Table 17.4 Time for Monitoring SCL
CKS3
CKS2
Time for Monitoring SCL
0 7.5
tcyc
0
1 19.5
tcyc
0 17.5
tcyc
1
1 41.5
tcyc
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