Renesas H8S Family Hardware Manual page 705

8. Notes on start condition issuance for retransmission

Figure 18.30 shows the timing of start condition issuance for retransmission, and the timing for

subsequently writing data to ICDR, together with the corresponding flowchart. Write the

transmit data to ICDR after the start condition for retransmission is issued and then the start

condition is actually generated.

Clear IRIC in ICCR

Read SCL pin

Set BBSY = 1,

SCP = 0 (ICCR)

Write transmit data to ICDR

[1] IRIC determination

Figure 18.30 Flowchart for Start Condition Issuance Instruction

Note: This restriction on usage can be canceled by setting the FNC1 and FNC0 bits to B'11 in

[3] (Retransmission) Start condition instruction issuance

[2] Determination of SCL = Low

for Retransmission and Timing

Section 18 I

[1] Wait for end of 1-byte transfer

[2] Determine whether SCL is low

[3] Issue start condition instruction for retransmission

[4] Determine whether start condition is generated or not

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

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

is executed continuously.

Start condition generation

(retransmission)

[5] ICDR write (transmit data)

[4] IRIC determination

Rev. 1.00 Mar. 12, 2008 Page 657 of 1178

C Bus Interface (IIC)

REJ09B0403-0100