HD64F2149YV datasheet(528/1075 Pages) RENESAS

528 / 1075 page

Section 16 I

2C Bus Interface

Rev. 3.00 Jan 18, 2006 page 500 of 1044

REJ09B0280-0300

TDRE

Description

The next transmit data is in ICDR (ICDRT), or transmission cannot

(Initial value)

be started

[Clearing conditions]

• When transmit data is written in ICDR (ICDRT) in transmit mode (TRS = 1)

• When a stop condition is detected in the bus line state after a stop condition is

issued with the I

2C bus format or serial format selected

• When a stop condition is detected with the I2C bus format selected

• In receive mode (TRS = 0)

(A 0 write to TRS during transfer is valid after reception of a frame containing an

acknowledge bit)

The next transmit data can be written in ICDR (ICDRT)

[Setting conditions]

• In transmit mode (TRS = 1), when a start condition is detected in the bus line state

after a start condition is issued in master mode with the I

2C bus format or serial

format selected

• At the first transmit mode setting (TRS = 1) (first transmit mode setting only) after

2C bus mode is switched to formatless mode

• When data is transferred from ICDRT to ICDRS

(Data transfer from ICDRT to ICDRS when TRS = 1 and TDRE = 0, and ICDRS is

empty)

• When receive mode (TRS = 0) is switched to transmit mode (TRS = 1 ) after

detection of a start condition (first transmit mode setting only)

RDRF

Description

The data in ICDR (ICDRR) is invalid

(Initial value)

[Clearing condition]

When ICDR (ICDRR) receive data is read in receive mode

The ICDR (ICDRR) receive data can be read

[Setting condition]

When data is transferred from ICDRS to ICDRR

(Data transfer from ICDRS to ICDRR in case of normal termination with TRS = 0 and

RDRF = 0)

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