H8SSLASH2224 datasheet(767/1071 Pages) RENESAS

767 / 1071 page

Section 16 I

2C Bus Interface (IIC) (Option)

Rev. 5.00 Aug 08, 2006 page 681 of 982

REJ09B0054-0500

8. Notes on Start Condition Issuance for Retransmission

Depending on the timing combination with the start condition issuance and the subsequently

writing data to ICDR, it may not be possible to issue the retransmission and the data

transmission after retransmission condition issuance.

After start condition issuance is done and determined the start condition, write the transmit

data to ICDR, as shown below. Figure 16.22 shows the timing of start condition issuance for

retransmission, and the timing for subsequently writing data to ICDR, together with the

corresponding flowchart.

SDA

IRIC

SCL

ACK

Bit 7

Data output

[3] (Restart) Start condition instruction issuance

[4] IRIC determination

[5] ICDR write (next transmit data)

[2] Detemination of SCL = Low

[1] IRIC determination

Start condition

(retransmission)

IRIC = 1?

Yes

Clear IRIC in ICSR

Read SCL pin

Write transmit data to ICDR

Write BBSY = 1,

SCP = 0 (ICSR)

[1]

[1] Wait for end of 1-byte transfer

[2] Determine whether SCL is low

[3] Issue restart condition instruction for transmission

[4] Determine whether start condition is generated or not

[5] Set transmit data (slave address + R/

[2]

[3]

[4]

[5]

Yes

IRIC = 1?

Yes

SCL = Low?

Start condition

issuance?

Other processing

Note: Program so that processing from [3] to [5]

is executed continuously.

Figure 16.22 Flowchart and Timing of Start Condition Instruction Issuance for

Retransmission

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