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R8C/20 Datasheet(PDF) 355 Page - Renesas Technology Corp

Part # R8C/20
Description  MCU R8C FAMILY / R8C/2x SERIES
PDF  501 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

R8C/20 Datasheet(HTML) 355 Page - Renesas Technology Corp

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R8C/20 Group, R8C/21 Group
16. Clock Synchronous Serial Interface
Rev.2.00 Aug 27, 2008
Page 339 of 458
REJ09B0250-0200
16.3.6
Bit Synchronization Circuit
When setting the I2C bus interface in master mode.
• When the SCL signal is driven to “L” by the slave device.
• Since the “H” period may become shorter while the SCL signal is driven to “L” by the slave device and the
rising speed of the SCL signal is lowered by the load (load capacity and pull-up resistor) of the SCL line,
the SCL signal is monitored and the communication synchronizes per bit.
Figure 16.45 shows the Timing of Bit Synchronous Circuit and Table 16.8 lists the Time between Changing
SCL Signal from “L” Output to High-Impedance and Monitoring of SCL Signal.
Figure 16.45
Timing of Bit Synchronous Circuit
1 Tcyc = 1/f1(s)
Table 16.8
Time between Changing SCL Signal from “L” Output to High-Impedance and
Monitoring of SCL Signal
ICCR1 Register
Time for Monitoring SCL
CKS3
CKS2
0
0
7.5 Tcyc
1
19.5 Tcyc
1
0
17.5 Tcyc
1
41.5 Tcyc
VIH
Basis clock of SCL
monitor timing
SCL
Internal SCL



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