Renesas H8S/2668 Series Bedienungsanleitung PDF herunterladen (Seite 6)

Start

Initialize

Read BBSY in ICCR2

BBSY=0?

Set MST and TRS in

ICCR1 to 1

Write 1 to BBSY

and 0 to SCP

Write transmit data

in ICDRT

TEND= 1?

Read TEND in ICSR

Yes

Read ACKBR in ICIER

ACKBR=0?

Transmit

mode?

Mater receive mode

Yes

Write transmit data

in ICDRT

Yes

TEND=1 ?

Read TEND in ICSR

Write 0 to BBSY

and SCP

Yes

STOP=1?

Read STOP in ICSR

Set MST and TRS

in ICCR1 to 0

End

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

Clear TDRE in ICSR

[11]

[12]

[13]

[1] Test the status of the SCL and SDA lines.

[2] Set master transmit mode.

[3] Issue the start condition.

[4] Wait for the SCL=0 output.

[5] Set the first byte (slave address + R/W) of

transmit data.

[6] Wait for 1 byte to be transmitted.

[7] Clear the TEND flag.

[8] Test the acknowledge transferred from the

specified slave device.

[9] Wait for the SCL=0 output.

[10] Set the second and subsequent bytes of transmit

data.

[11] Wait for the completion of transmission.

[12] Clear the TEND flag.

[13] Test the acknowledge.

[14] Test the last byte.

[15] Clear the STOP flag.

[16] Issue the stop condition.

[17] Wait for the creation of stop condition.

[18] Set slave receive mode.

[19] Clear the TDRE flag.

Clear TEND in ICSR

[14]

SCLO=0?

Yes

Read SCLO in ICCR2

SCLO=0?

Last byte?

Clear STOP in ICSR

Yes

[10]

Clear TEND in ICSR

Read ACKBR in ICIER

ACKBR=0?

Yes

[15]

[16]

[17]

[19]

[18]

Figure 2-4 Sample Flowchart for Master Transmit Mode

1 2 3 4 5 6

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