h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 538

• Manufacturer Part Number: h8s-2161b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 16 I
11. Note on IRIC flag clear when the wait function is used
Note: This restriction on usage can be canceled by setting the FNC1 and FNC0 bits to 1 in
Rev. 3.00 Mar 21, 2006 page 484 of 788
REJ09B0300-0300
If the rise time of SCL exceeds the stipulated value or a slave device in which a wait can be
inserted by driving the SCL pin low is used when the wait function is used in I
master mode, the IRIC flag should be cleared after determining that the SCL is low, as
described below.
If the IRIC flag is cleared to 0 when WAIT = 1 while the SCL is extending the high level time,
the SDA level may change before the SCL goes low, which may generate a start or stop
condition erroneously.
ICXR.
SDA
IRIC
SCL
2
C Bus Interface (IIC) (Optional)
Figure 16.34 IRIC Flag Clearing Timing When WAIT = 1
SCL = low detected
VIH
[1] SCL = low determination
Secures a high period
[2] IRIC clear
2
C bust interface