CHAPTER 15 SERIAL INTERFACE IICA
Page 473 of 920
Figure 15 - 36 Master Operation in Multi-Master System (2/3)
Note
The wait time is calculated as follows.
(IICWLn setting value + IICWHn setting value + 4) / f
MCK
+ t
F
×
2
Remark1.
IICWLn:
IICA low-level width setting register n
IICWHn:
IICA high-level width setting register n
t
F
:
SDAAn and SCLAn signal falling times
f
MCK
:
IICA operating clock frequency
Remark2.
n = 0, 1
A
STTn = 1
Wait
Slave operation
Yes
MSTSn = 1?
EXCn = 1 or COIn =1?
Prepares for starting communication
(generates a start condition).
Waits for bus release
(communication being reserved).
Wait state after stop condition
was detected and start condition
was generated by the communication
reservation function.
No
INTIICAn
interrupt occurs?
Yes
Yes
No
No
C
Enables reserving communication.
Secure wait time
Note
by software.
Co
mmu
ni
ca
tio
n pr
oces
si
ng
C
o
m
m
un
ic
at
io
n proce
ssing
B
STTn = 1
Wait
Slave operation
Yes
IICBSYn = 0?
EXCn = 1 or COIn =1?
Prepares for starting communication
(generates a start condition).
Disables reserving communication.
Waits for bus release
Detects a stop condition.
No
No
INTIICAn
interrupt occurs?
Yes
Yes
No
Yes
STCFn = 0?
No
D
C
D
Wait for 5 f
MCK
clocks.
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