HD6432138SW datasheet(516/1061 Pages) RENESAS

516 / 1061 page

Section 16 I

2C Bus Interface [H8S/2138 Group Option]

Rev. 4.00 Jun 06, 2006 page 462 of 1004

REJ09B0301-0400

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

the mode is switched from I

2C bus mode 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 detecting a start condition and then switching from slave receive mode (TRS

= 0) state to transmit mode (TRS = 1) (first transmit mode switching 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)

HD6432138SW Datasheet(PDF) 516 Page - Renesas Technology Corp

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