h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 368

• Manufacturer Part Number: h8s-2111b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

13.4.8
The logic levels at the SCL and SDA pins are routed through noise cancellers before being latched
internally. Figure 13.28 shows a block diagram of the noise canceller.
The noise canceller consists of two cascaded latches and a match detector. The SCL (or SDA) pin
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.
Rev. 1.00, 05/04, page 334 of 544
SCL or
SDA input signal
Sampling
clock
Noise Canceller
D
Sampling clock
System clock
Figure 13.28 Block Diagram of Noise Canceler
cycle
Latch
C
Q
D
Latch
C
Q
detector
Match
Internal SCL or
SDA signal