Section 17 I
2
C Bus Interface (IIC)
Rev. 3.00 Jan 25, 2006 page 478 of 872
REJ09B0286-0300
ICDR can be written to and read from only when the ICE bit is set to 1 in ICCR. The initial value
of ICDR is undefined.
The ICDRE and ICDRF flags are set and cleared under the conditions shown below. Setting the
ICDRE and ICDRF flags affects the status of the interrupt flags.
Bit
Bit Name
Initial Value R/W
Description
—
ICDRE
—
—
Transmit Data Register Empty
[Setting conditions]
•
When satisfaction of a start condition is detected in
the bus line state with the I
2
C bus format or serial
format selected
•
When data is transferred from the transmit buffer to
the shift register
(Data transfer from the transmit buffer to the shift
register if the shift register is empty when ICDRE = 0
in transmit mode)
(Do not write to ICDR in receive mode because the
ICDRE flag value is invalid)
[Clearing conditions]
•
When transmit data is written in ICDR (transmit
buffer) in transmit mode
•
When satisfaction of a stop condition is detected in
the bus line state with the I
2
C bus format or serial
format selected
If transmit data is written to ICDR (transmit buffer) in
transmit mode when ICDR does not contain data to
be transmitted, ICDRE is cleared to 0. However, since
data is transferred from the transmit buffer to the shift
register immediately, ICDRE is set to 1 again.
•
Internal state initialization
(Writing 0 to the TRS bit in ICCR during transfer is
valid after reception of a frame containing an
acknowledge bit)
Содержание H8S/2158
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Страница 36: ...Rev 3 00 Jan 25 2006 page xxxiv of lii B Product Lineup 863 C Package Dimensions 864 Index 865...
Страница 47: ...Rev 3 00 Jan 25 2006 page xlv of lii Appendix Figure C 1 Package Dimensions TBP 112A 864...
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Страница 70: ...Section 1 Overview Rev 3 00 Jan 25 2006 page 16 of 872 REJ09B0286 0300...
Страница 118: ...Section 3 MCU Operating Modes Rev 3 00 Jan 25 2006 page 64 of 872 REJ09B0286 0300...
Страница 126: ...Section 4 Exception Handling Rev 3 00 Jan 25 2006 page 72 of 872 REJ09B0286 0300...
Страница 198: ...Section 6 Bus Controller Rev 3 00 Jan 25 2006 page 144 of 872 REJ09B0286 0300...
Страница 326: ...Section 10 8 Bit PWM Timer PWM Rev 3 00 Jan 25 2006 page 272 of 872 REJ09B0286 0300...
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...
Страница 750: ...Section 21 D A Converter Rev 3 00 Jan 25 2006 page 696 of 872 REJ09B0286 0300...
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...
Страница 844: ...Section 27 Power Down Modes Rev 3 00 Jan 25 2006 page 790 of 872 REJ09B0286 0300...
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...