Renesas H8S/2111B Manual de usuario descargar pdf (Pagina 325)

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Rev. 1.00, 05/04, page 291 of 544

Bit Bit Name

Initial

Value R/W Description

BBSY

SCP

R/W*

Bus Busy

Start Condition/Stop Condition Prohibit

In master mode:

• Writing 0 in BBSY and 0 in SCP: A stop condition is

issued

• Writing 1 in BBSY and 0 in SCP: A start condition

and a restart condition are issued

In slave mode:

• Writing to the BBSY flag is disabled.

[BBSY setting condition]

When the SDA level changes from high to low under the

condition of SCL = high, assuming that the start condition

has been issued.

[BBSY clearing condition]

When the SDA level changes from low to high under the

condition of SCL = high, assuming that the stop condition

has been issued.

To issue a start/stop condition, use the MOV instruction.

The I

C bus interface must be set in master transmit

mode before the issue of a start condition. Set MST to 1

and TRS to 1 before writing 1 in BBSY and 0 in SCP.

The BBSY flag can be read to check whether the I

C bus

(SCL, SDA) is busy or free.

The SCP bit is always read as 1. If 0 is written, the data

is not stored.

Note: * The value in BBSY flag does not change even if written.

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Renesas H8S/2111B Manual de usuario Pagina 325

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