H8SSLASH2225 datasheet(732/1071 Pages) RENESAS

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Section 16 I

2C Bus Interface (IIC) (Option)

Rev. 5.00 Aug 08, 2006 page 646 of 982

REJ09B0054-0500

Bit

Bit Name

Initial

Value

R/W

Description

IRIC

R/W

2C Bus Interface Interrupt Request Flag

Also see table 16.4.

[Setting conditions]

In I

2C bus format master mode

• When a start condition is detected in the bus line state

after a start condition is issued (when the TDRE flag is set

to 1 because of first frame transmission)

• When a wait is inserted between the data and

acknowledge bit when WAIT = 1

• At the end of data transfer (when the TDRE or RDRF flag

is set to 1)

• When a slave address is received after bus arbitration is

lost (when the AL flag is set to1)

• When 1 is received as the acknowledge bit when the

ACKE bit is 1(when the ACKB bit is set to 1)

In I

2C bus format slave mode

• When the slave address (SVA, SVAX) matches (when the

AAS and AASX flags are set to 1) and at the end of data

transfer up to the subsequent retransmission start

condition or stop condition detection (when the TDRE or

RDRF flag is set to 1)

• When the general call address (one frame including a R/W

bit is H'00) is detected (when the ADZ flag is set to 1) and

at the end of data transfer up to the subsequent

retransmission start condition or stop condition

detection(when the TDRE or RDRF flag is set to 1)

• When 1 is received as the acknowledge bit when the

ACKE bit is 1(when the ACKB bit is set to 1)

• When a stop condition is detected (when the STOP or

ESTP flag is set to 1)

With clocked synchronous serial format

• At the end of data transfer (when the TDRE or RDRF flag

is set to 1)

• When a start condition is detected with serial format

selected

When a condition occurs in which internal flag of TDRE and

RDFR is set to 1 except for the above

[Clearing conditions]

• When 0 is written in IRIC after reading IRIC = 1

• When ICDR is read/written by DTC

(When TDRE or RDRF flag is cleared to 0)

(AS it might not be a condition to clear, for details, see section

16.4.8, Operation Using the DTC).

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