
Rev. 1.0, 09/01, page 735 of 904
16.6
Bit Synchronous Circuit
In master mode,
•
When SCL is driven to low by the slave device
•
When the rising speed of SCL is lower by the load of the SCL line (load capacitance or pull-up
resistance)
This module has a possibility that high level period may be short in the two states described
above. Therefore it monitors SCL and communicates by bit with synchronization.
Figure 16.18 shows the timing of the bit synchronous circuit and table 16.4 shows the time when
SCL output changes from low to Hi-Z then SCL is monitored.
SCL
VIH
SCL monitor
timing reference
clock
Internal SCL
Figure 16.18 Timing of the Bit Synchronous Circuit
Table 16.4
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
Содержание H8S/2376 F-ZTAT
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