SH7721 datasheet(718/1524 Pages) RENESAS

718 / 1524 page

Section 20

2C Bus Interface (IIC)

Rev. 3.00 Jan. 18, 2008 Page 656 of 1458

REJ09B0033-0300

Bit

Bit Name

Initial

Value

R/W

Description

NACKF

R/W

No Acknowledge Detection Flag

[Setting condition]

• When no acknowledge is detected from the receive

device in transmission while the ACKE bit in ICIER is

[Clearing condition]

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

STOP

R/W

Stop Condition Detection Flag

[Setting conditions]

• In master mode: when a stop condition is detected

after frame transfer is completed

• In slave mode: when a stop condition is detected after

the address set in SAR matches the salve address

that comes as the first byte after the detection of a

start condition

[Clearing condition]

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

AL/OVE

R/W

Arbitration Lost Flag/Overrun Error Flag

This flag indicates that arbitration was lost in master

mode with the I

2C bus format.

When two or more master devices attempt to seize the

bus at nearly the same time, if the I

2C bus interface

detects data differing from the data it sent, it sets AL to 1

to indicate that the bus has been taken by another

master.

[Setting conditions]

• If the internal SDA and SDA pin disagree at the rise of

SCL in master transmit mode

• When the SDA pin outputs high in master mode while

a start condition is detected

[Clearing condition]

• When 0 is written in AL/OVE after reading AL/OVE =

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