Renesas H8S/2111B - Manual (Page 365)

Rev. 1.00, 05/04, page 331 of 544
13.4.7 IRIC Setting Timing and SCL Control
The interrupt request flag (IRIC) is set at different times depending on the WAIT bit in ICMR, the
FS bit in SAR, and the FSX bit in SARX. If the ICDRE or ICDRF flag is set to 1, SCL is
automatically held low after one frame has been transferred in synchronization with the internal
clock. Figures 13.25 to 13.27 show the IRIC set timing and SCL control.
SCL
SDA
IRIC
User processing
Clear IRIC
2 3 1 A 8 7
3 2 1 9 8 7
When WAIT = 0, and FS = 0 or FSX = 0 (I 2 C bus format, no wait)
(a) Data transfer ends with ICDRE = 0 at transmission, or ICDRF = 0 at reception.
(b) Data transfer ends with ICDRE = 1 at transmission, or ICDRF = 1 at reception.
SCL
SDA
IRIC
User processing
Clear IRIC Clear IRIC Write to ICDR (transmit)
or read from ICDR (receive)
1 A 8 7
1 9 8 7
Figure 13.25 IRIC Setting Timing and SCL Control (1)