p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 469

• Manufacturer Part Number: p2125vps20
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Note: This restriction on usage can be canceled by setting the FNC1 and FNC0 bits to B'11 in
SCL
SDA
IRIC
[1] IRIC determination
Write transmit data to ICDR
ICXR.
Clear IRIC in ICCR
Yes
SCP = 0 (ICCR)
Set BBSY = 1,
ACK
Read SCL pin
SCL = Low?
Figure 16.30 Flowchart for Start Condition Issuance Instruction
IRIC = 1?
IRIC = 1?
[2] Determination of SCL = Low
9
Yes
Yes
No
No
No
for Retransmission and Timing
[3] (Retransmission) Start condition instruction issuance
[1]
[2]
[3]
[4]
[5]
Start condition generation
(retransmission)
[4] IRIC determination
[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.
[5] ICDR write (transmit data)
Rev. 1.00 Sep. 21, 2006 Page 431 of 658
Section 16 I
Bit7
2
C Bus Interface (IIC)
REJ09B0310-0100