Section 17 I
2
C Bus Interface (IIC)
Rev. 3.00 Jan 25, 2006 page 544 of 872
REJ09B0286-0300
7. Notes on ICDR read at end of master reception
To halt reception after completion of a receive operation in master receive mode, set the TRS
bit to 1 and write 0 to BBSY and SCP in ICCR. This changes the SDA pin from low to high
when the SCL pin is high, and generates the stop condition. After this, receive data can be read
by means of an ICDR read, but if data remains in the buffer, the ICDRS receive data will not
be transferred to ICDR, and so it will not be possible to read the second byte of data. If it is
necessary to read the second byte of data, issue the stop condition in master receive mode (i.e.
with the TRS bit cleared to 0). When reading the receive data, first confirm that the BBSY bit
in ICCR is cleared to 0, the stop condition has been generated, and the bus has been released,
then read ICDR with TRS cleared to 0. Note that if the receive data (ICDR data) is read in the
interval between execution of the instruction for issuance of the stop condition (writing 0 to the
BBSY bit in ICCR) and the actual generation of the stop condition, the clock may not be
output correctly in subsequent master transmission. Rewriting of IIC control bits for changing
the operating mode and settings for transmission/reception, such as clearing the MST bit after
master transmit/receive operation has ended, must be done during interval (a) in figure 17.22.
SDA
SCL
Internal clock
BBSY bit
Master receive mode
ICDR read
disabled period
Bit 0
A
8
9
Stop condition
(a)
Start condition
Execution of instruction
for issuing stop condition
(write 0 to BBSY and SCP)
Confimation of stop
condition issuance
(read BBSY = 0)
Start condition
issuance
Figure 17.22 Notes on Reading Master Receive Data
8. Notes on start condition issuance for retransmission
Depending on the timing combination with the start condition issuance and the subsequently
writing data to ICDR, it may not be possible to issue the retransmission condition and the data
transmission after retransmission condition issuance.
Содержание H8S/2158
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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...