Section 17 I
2
C Bus Interface 3 (IIC3)
Rev. 0.50 May 18, 2006 Page 845 of 1588
REJ09B0313-0050
17.6
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 17.22 shows the timing of the bit synchronous circuit and table 17.5 shows the time when
the SCL output changes from low to Hi-Z then SCL is monitored.
SCL
V
IH
Time for monitoring
SCL (on-board)
SCL monitor
timing reference
clock
Internal SCL
Figure 17.22 Bit Synchronous Circuit Timing
Table 17.5 Time for Monitoring SCL
CKS3
CKS2
Time for Monitoring SCL
*
1
0 9
tpcyc
*
2
0
1 21
tpcyc
*
2
0 19
tpcyc
*
2
1
1 43
tpcyc
*
2
Notes: 1. Monitors the (on-board) SCL level after the time (pcyc) for monitoring SCL has passed
since the rising edge of the SCL monitor timing reference clock.
2. pcyc = P
φ
×
cyc
Содержание Single-Chip Microcomputer SH7203
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Страница 668: ...Section 11 Multi Function Timer Pulse Unit 2 MTU2 Rev 0 50 May 18 2006 Page 638 of 1588 REJ09B0313 0050 ...
Страница 696: ...Section 13 Watchdog Timer WDT Rev 0 50 May 18 2006 Page 666 of 1588 REJ09B0313 0050 ...
Страница 726: ...Section 14 Realtime Clock RTC Rev 0 50 May 18 2006 Page 696 of 1588 REJ09B0313 0050 ...
Страница 796: ...Section 15 Serial Communication Interface with FIFO SCIF Rev 0 50 May 18 2006 Page 766 of 1588 REJ09B0313 0050 ...
Страница 876: ...Section 17 I2 C Bus Interface 3 IIC3 Rev 0 50 May 18 2006 Page 846 of 1588 REJ09B0313 0050 ...
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Страница 1054: ...Section 21 D A Converter DAC Rev 0 50 May 18 2006 Page 1024 of 1588 REJ09B0313 0050 ...
Страница 1226: ...Section 23 USB 2 0 Host Function Module USB Rev 0 50 May 18 2006 Page 1196 of 1588 REJ09B0313 0050 ...
Страница 1294: ...Section 24 LCD Controller LCDC Rev 0 50 May 18 2006 Page 1264 of 1588 REJ09B0313 0050 ...
Страница 1386: ...Section 26 I O Ports Rev 0 50 May 18 2006 Page 1356 of 1588 REJ09B0313 0050 ...
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Страница 1598: ...Section 31 Electrical Characteristics Rev 0 50 May 18 2006 Page 1568 of 1588 REJ09B0313 0050 ...
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