HD6433694 Datasheet, PDF (278/432 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

15.6 Bit Synchronous Circuit
In master mode,this module has a possibility that high level period may be short in the two states
described below.
• When SCL is driven to low by the slave device
• When the rising speed of SCL is lowered by the load of the SCL line (load capacitance or pull-
up resistance)
Therefore, it monitors SCL and communicates by bit with synchronization.
Figure 15.21 shows the timing of the bit synchronous circuit and table 15.4 shows the time when
SCL output changes from low to Hi-Z then SCL is monitored.
SCL monitor
timing reference
clock
SCL
VIH
Internal SCL
Figure 15.21 The Timing of the Bit Synchronous Circuit
Table 15.4 Time for Monitoring SCL
CKS3
0
1
CKS2
0
1
0
1
Time for Monitoring SCL
7.5 tcyc
19.5 tcyc
17.5 tcyc
41.5 tcyc
Rev. 4.00, 03/04, page 250 of 400