Datasheet

Section 16 I

C Bus Interface (IIC) (Optional)

Rev. 3.00 Mar 21, 2006 page 439 of 788

REJ09B0300-0300

Bit Bit Name Initial Value R/W Description

5 ICDRF 0 R Receive Data Read Request Flag

Indicates the ICDR (ICDRR) status in receive mode.

0: Indicates that the data has been already read from ICDR

(ICDRR) or ICDR is initialized.

1: Indicates that data has been received successfully and

transferred from ICDRS to ICDRR, and the data is ready

to be read out.

[Setting conditions]

• When data is received successfully and transferred

from ICDRS to ICDRR.

(1) When data is received successfully while ICDRF = 0

(at the rise of the 9th clock pulse).

(2) When ICDR is read successfully in receive mode after

data was received while ICDRF = 1.

[Clearing conditions]

• When ICDR (ICDRR) is read.

• When 0 is written to the ICE bit.

• When the IIC is internally initialized using the CLR3 to

CLR0 bits in DDCSWR.

When ICDRF is set due to the condition (2) above, ICDRF

is temporarily cleared to 0 when ICDR (ICDRR) is read;

however, since data is transferred from ICDRS to ICDRR

immediately, ICDRF is set to 1 again.

Note that ICDR cannot be read successfully in transmit

mode (TRS = 1) because data is not transferred from

ICDRS to ICDRR. Be sure to read data from ICDR in

receive mode (TRS = 0).