Section 17 I
2
C Bus Interface (IIC)
Rev. 3.00 Jan 25, 2006 page 534 of 872
REJ09B0286-0300
System clock
cycle
Sampling clock
C
D
Q
Latch
C
D
Q
Latch
SCL or
SDA input
signal
Match
detector
Internal
SCL or
SDA
signal
Sampling
clock
Figure 17.17 Block Diagram of Noise Canceler
17.5.9
Initialization of Internal State
The IIC has a function for forcible initialization of its internal state if a deadlock occurs during
communication.
Initialization is executed in accordance with the setting of bits CLR3 to CLR0 in ICCRX or
clearing the ICE bit. For details on the setting of bits CLR3 to CLR0, see section 17.3.7, IIC
Operation Reservation Adapter Control Register (ICCRX).
Scope of Initialization:
The initialization executed by this function covers the following items:
•
ICDRE and ICDRF internal flags
•
Transmit/receive sequencer and internal operating clock counter
•
Internal latches for retaining the output state of the SCL and SDA pins (wait, clock, data
output, etc.)
The following items are not initialized:
•
Actual register values (ICDR, SAR, SARX, ICMR, ICCR, ICSR, ICXR (other than ICDRE
and ICDRF flags), ICCRX, ICSRA, ICSRB, ICSRC, ICRRX, ICDRS, ICCNT, ICCMD)
•
Internal latches used to retain register read information for setting/clearing flags in ICMR,
ICCR, ICSR, ICSRB, and ICSRC
•
The value of the ICMR register bit counter (BC2 to BC0)
•
Generated interrupt sources (interrupt sources transferred to the interrupt controller)
Содержание H8S/2158
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Страница 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Страница 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
Страница 742: ...Section 19 Multimedia Card Interface MCIF Rev 3 00 Jan 25 2006 page 688 of 872 REJ09B0286 0300...
Страница 744: ...Section 20 Encryption Operation Circuit DES and GF Rev 3 00 Jan 25 2006 page 690 of 872 REJ09B0286 0300...
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Страница 768: ...Section 22 A D Converter Rev 3 00 Jan 25 2006 page 714 of 872 REJ09B0286 0300...
Страница 770: ...Section 23 RAM Rev 3 00 Jan 25 2006 page 716 of 872 REJ09B0286 0300...
Страница 824: ...Section 26 Clock Pulse Generator Rev 3 00 Jan 25 2006 page 770 of 872 REJ09B0286 0300...
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Страница 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Страница 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...