SH7721 datasheet(717/1524 Pages) RENESAS

717 / 1524 page

Section 20

2C Bus Interface (IIC)

Rev. 3.00 Jan. 18, 2008 Page 655 of 1458

REJ09B0033-0300

20.3.5

2C Bus Status Register (ICSR)

ICSR performs confirmation of interrupt request flags and status.

Bit

Bit Name

Initial

Value

R/W

Description

TDRE

R/W

Transmit Data Register Empty

[Setting condition]

• When data is transferred from ICDRT to ICDRS and

ICDRT becomes empty

• When TRS is set

• When a start condition (including re-transfer) has

been issued

• When transmit mode is entered from receive mode in

slave mode

[Clearing conditions]

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

• When data is written to ICDRT with an instruction

TEND

R/W

Transmit End

[Setting conditions]

• When the ninth clock of SCL rises with the I2C bus

format while the TDRE flag is 1

[Clearing conditions]

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

• When data is written to ICDRT with an instruction

RDRF

R/W

Receive Data Register Full

[Setting condition]

• When a receive data is transferred from ICDRS to

ICDRR

[Clearing conditions]

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

• When ICDRR is read with an instruction

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