Datasheet

Rev. 3.00, 03/04, page 468 of 830
Figure 15.7 shows the sample flowchart for the operations in master transmit mode.
Start
Initialize IIC
Set MST = 1 and
TRS = 1 in ICCR
Set BBSY =1 and
SCP = 0 in ICCR
Write transmit data in ICDR
Clear IRIC in ICCR
No
No
Yes
Yes
Yes
Yes
No
No
[1] Initialization
[3] Select master transmit mode.
[4] Start condition issuance
[6] Set transmit data for the first byte
(slave address + R/W).
(After writing to ICDR, clear IRIC
continuously.)
[9] Set transmit data for the second and
subsequent bytes.
(After writing to ICDR, clear IRIC
immediately.)
[2] Test the status of the SCL and SDA lines.
[7] Wait for 1 byte to be transmitted.
[10] Wait for 1 byte to be transmitted.
[11] Determine end of transfer
[12] Stop condition issuance
[8] Test the acknowledge bit
transferred from the slave device.
[5] Wait for a start condition generation
Read IRIC in ICCR
Read ACKB in ICSR
IRIC = 1?
ACKB = 0?
Transmit mode?
Write transmit data in ICDR
Clear IRIC in ICCR
Read IRIC in ICCR
Read ACKB in ICSR
Clear IRIC in ICCR
End of transmission?
(ACKB = 1?)
Set BBSY = 0 and
SCP = 0 in ICCR
End
Read BBSY in ICCR
BBSY = 0?
Yes
No
Read IRIC in ICCR
IRIC = 1?
Yes
No
Yes
No
IRIC = 1?
Master receive mode
Figure 15.7 Sample Flowchart for Operations in Master Transmit Mode
The transmission procedure and operations by which data is sequentially transmitted in
synchronization with ICDR (ICDRT) write operations, are described below.