Section 17 I
2
C Bus Interface (IIC)
Rev. 3.00 Jan 25, 2006 page 546 of 872
REJ09B0286-0300
9. Note on when I
2
C bus interface stop condition instruction is issued
In a situation where the rise time of the 9th clock of SCL exceeds the stipulated value because
of a large bus load capacity or where a slave device in which a wait can be inserted by driving
the SCL pin low is used, the stop condition instruction should be issued after reading SCL after
the rise of the 9th clock pulse and determining that it is low, as shown in figure 17.24.
Stop condition generation
SCL
IRIC
[1] SCL = low judgement
V
[2] Stop condition instruction issuance
SDA
9th clock
Secures a high period
SCL is detected as low
because the rise of the
waveform is delayed
IH
Figure 17.24 Stop Condition Issuance Timing
10. Note on IRIC flag clearing when wait function is used
When the wait function is used in I
2
C bus interface master mode and in a situation where the
rise time of SCL exceeds the stipulated value or where a slave device in which a wait can be
inserted by driving the SCL pin low is used, the IRIC flag should be cleared after determining
that the SCL pin is low.
If the IRIC flag is cleared to 0 when WAIT = 1 while the SCL is extending the high level time,
the SDA level may change before the SCL goes low, which may generate a start or stop
condition erroneously.
SCL
IRIC
[1] SCL = low determination
V
IH
[2] IRIC clear
SDA
9th clock
Secures a high period
SCL = low detected
Figure 17.25 IRIC Flag Clearing Timing When WAIT = 1
Summary of Contents for H8S/2158
Page 10: ...Rev 3 00 Jan 25 2006 page viii of lii...
Page 36: ...Rev 3 00 Jan 25 2006 page xxxiv of lii B Product Lineup 863 C Package Dimensions 864 Index 865...
Page 47: ...Rev 3 00 Jan 25 2006 page xlv of lii Appendix Figure C 1 Package Dimensions TBP 112A 864...
Page 54: ...Rev 3 00 Jan 25 2006 page lii of lii...
Page 70: ...Section 1 Overview Rev 3 00 Jan 25 2006 page 16 of 872 REJ09B0286 0300...
Page 118: ...Section 3 MCU Operating Modes Rev 3 00 Jan 25 2006 page 64 of 872 REJ09B0286 0300...
Page 126: ...Section 4 Exception Handling Rev 3 00 Jan 25 2006 page 72 of 872 REJ09B0286 0300...
Page 198: ...Section 6 Bus Controller Rev 3 00 Jan 25 2006 page 144 of 872 REJ09B0286 0300...
Page 326: ...Section 10 8 Bit PWM Timer PWM Rev 3 00 Jan 25 2006 page 272 of 872 REJ09B0286 0300...
Page 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Page 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
Page 742: ...Section 19 Multimedia Card Interface MCIF Rev 3 00 Jan 25 2006 page 688 of 872 REJ09B0286 0300...
Page 750: ...Section 21 D A Converter Rev 3 00 Jan 25 2006 page 696 of 872 REJ09B0286 0300...
Page 768: ...Section 22 A D Converter Rev 3 00 Jan 25 2006 page 714 of 872 REJ09B0286 0300...
Page 770: ...Section 23 RAM Rev 3 00 Jan 25 2006 page 716 of 872 REJ09B0286 0300...
Page 824: ...Section 26 Clock Pulse Generator Rev 3 00 Jan 25 2006 page 770 of 872 REJ09B0286 0300...
Page 844: ...Section 27 Power Down Modes Rev 3 00 Jan 25 2006 page 790 of 872 REJ09B0286 0300...
Page 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Page 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...