HD6433694 Datasheet, PDF (272/432 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

SCL
SDA
(Input)
MST
1
2
Bit 0 Bit 1
7
8
1
Bit 6 Bit 7 Bit 0
7
8
1
2
Bit 6 Bit 7
Bit 0
TRS
RDRF
ICDRS
Data 1
Data 2
Data 3
ICDRR
User
processing ^{[2] Set MST}
(when outputting the clock)
Data 1
[3] Read ICDRR
Figure 15.15 Receive Mode Operation Timing
Data 2
[3] Read ICDRR
15.4.7 Noise Canceler
The logic levels at the SCL and SDA pins are routed through noise cancelers before being latched
internally. Figure 15.16 shows a block diagram of the noise canceler circuit.
The noise canceler consists of two cascaded latches and a match detector. The SCL (or SDA)
input signal is sampled on the system clock, but is not passed forward to the next circuit unless the
outputs of both latches agree. If they do not agree, the previous value is held.
Sampling clock
SCL or SDA
input signal
C
D
Q
Latch
C
D
Q
Latch
March detector
Internal
SCL or SDA
signal
Sampling
clock
System clock
period
Figure 15.16 Block Diagram of Noise Conceler
Rev. 4.00, 03/04, page 244 of 400