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SH7721 Datasheet(PDF) 738 Page - Renesas Technology Corp

Part # SH7721
Description  Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
PDF  1524 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7721 Datasheet(HTML) 738 Page - Renesas Technology Corp

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Section 20
I
2C Bus Interface (IIC)
Rev. 3.00 Jan. 18, 2008 Page 676 of 1458
REJ09B0033-0300
20.6
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 20.21 shows the timing of the bit synchronous circuit and table 20.4 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 20.18
The Timing of the Bit Synchronous Circuit
Table 20.4
Time for Monitoring SCL
CKS3
CKS2
Time for Monitoring SCL
0
7.5 tpcyc
0
1
19.5 tpcyc
0
17.5 tpcyc
1
1
41.5 tpcyc



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