Bit Synchronous Circuit; Figure 16.22 The Timing Of The Bit Synchronous Circuit; Table 16.4 Time For Monitoring Scl - Renesas HD6417641 Hardware Manual

16.6

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 16.22 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 monitor
timing reference
clock
SCL
Internal SCL

Figure 16.22 The Timing of the Bit Synchronous Circuit

Table 16.4 Time for Monitoring SCL

CKS3 CKS2
0 0
1
1 0
1
Note: The pcyc indicates the peripheral clock cycle.
V
IH
CKS2CYC Time for Monitoring SCL
0 6.5 pcyc
1 5.5 pcyc
0 18.5 pcyc
1 17.5 pcyc
0 16.5 pcyc
1 15.5 pcyc
0 40.5 pcyc
1 39.5 pcyc
Rev. 4.00 Sep. 14, 2005 Page 507 of 982
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Section 16 I C Bus Interface 2 (IIC2)
REJ09B0023-0400