HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 582
HD6417144
Manufacturer Part Number
HD6417144
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417144.pdf
(930 pages)
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14. I
13. Points for cautions when setting TRS bit in slave mode
Rev.4.00 Mar. 27, 2008 Page 538 of 882
REJ09B0108-0400
In I
valid if it is set from the time when the rising edge of the 9th cycle or the stop condition is
detected until the time when the next rising edge on the SCL pin is detected (the period
indicated as (a) in figure 14.35).
However, if the TRS bit is set outside the period mentioned above (the period indicated as (b)
in figure 14.35), the bit value does not become valid immediately because it is suspended until
the rising edge of the 9th cycle or the stop condition is detected. Therefore, when the address is
received after the re-transmission start condition input without the stop condition, the effective
TRS bit value remains 1 (transmit mode) internally and thus the acknowledge bit is not
transmitted after the address has been received at the 9th cycle of the clock.
To receive the address in slave mode, clear the TRS bit to 0 during the time indicated as (a) in
figure 14.35.
To release SCL low-level fixation that is held by means of the wait function in slave mode,
clear the TRS bit to 0 and then dummy-read ICDR.
2
C Bus Interface (IIC) Option
2
C bus interface slave mode, the value set to the TRS bit in ICCR immediately becomes
SDA
TRS
SCL
Detection of rise of 9th cycle
transmission
Data
Figure 14.35 Timing for Setting TRS Bit in Slave Mode
8
9
TRS bit setting
(a)
Resumption condition
ICDR dummy read
Period in which TRS bit setting is retained
1
Address reception
2
(b)
3
4
5
6
Detection of rise of 9th cycle
7
8
9
A
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