HD6432138SW datasheet(555/1061 Pages) RENESAS

555 / 1061 page

Section 16 I

2C Bus Interface [H8S/2138 Group Option]

Rev. 4.00 Jun 06, 2006 page 501 of 1004

REJ09B0301-0400

Start

Initialize

Read BBSY in ICCR

BBSY = 0?

Yes

Set MST = 1 and

TRS = 1 in ICCR

Write BBSY = 1

and SCP = 0 in ICCR

Clear IRIC in ICCR

Read IRIC in ICCR

Yes

IRIC = 1?

Write transmit data in ICDR

Read ACKB in ICSR

ACKB = 0?

Yes

Transmit mode?

Write transmit data in ICDR

Read IRIC in ICCR

IRIC = 1?

Yes

Clear IRIC in ICCR

Read ACKB in ICSR

End of transmission

or ACKB = 1?

Yes

Write BBSY = 0

and SCP = 0 in ICCR

End

Master receive mode

Read IRIC in ICCR

IRIC = 1?

Clear IRIC in ICCR

[1] Initialize

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

[3] Select master transmit mode.

[4] Start condition issuance

[5] Wait for a start condition generation

[6] Set transmit data for the first byte (slave

address + R/

W).

(After writing ICDR, clear IRIC

immediately)

[7] Wait for 1 byte to be transmitted.

[8] Test the acknowledge bit, transferred from

slave device.

[10] Wait for 1 byte to be transmitted.

[11] Test for end of transfer

[12] Stop condition issuance

[9] Set transmit data for the second and

subsequent bytes.

(After writing ICDR, clear IRIC

immediately)

Figure 16.14 Flowchart for Master Transmit Mode (Example)

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