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Chapter 12 Serial Interface 3
Operation
XII - 33
Figure 12-3-17 Master Reception Timing
Master Reception Timing
SDA
SCL
Interrupt
12
. .
. .
8 ACK 1 2
8
IICBSY
Set data to SC3TRB
Clear IICBSY flag
(1)
(2) (3)
(4) (5)
(6)
Set data to SC3TRB
ACK
8-bit
transmission
8-bit
reception
[Set dummy data]
(1) Output start condition.
(2) Bus released period, ACK bit is received.
(3) Interrupt transaction
- Setup for the reception mode : SC3REX = 0 →1
- Disable start condition : SC3STE = 1 →0
- Start communication : set data to SC3TRB.
(4) Output ACK bit.
(5) Bus released period, interrupt transaction
- Complete communication : clear IICBSY flag
(6) Generate stop condition.