Microchip Technology DM164134 Data Sheet
© 2006 Microchip Technology Inc.
DS41159E-page 175
PIC18FXX8
FIGURE 17-22:
I
2
C™ MASTER MODE WAVEFORM (RECEPTION, 7-BIT ADDRESS)
P
9
8
7
6
5
D0
D1
D2
D3
D4
D5
D6
D7
S
A7
A6
A5
A4
A3
A2
A1
SDA
SCL
12
3
4
5
6
7
8
9
12
3
4
5
67
8
9
12
3
4
B
u
s m
a
ster
ter
m
inate
s
tra
n
sfer
AC
K
Re
ce
ivin
g
Da
ta
fr
o
m
Sl
a
v
e
Re
ce
ivin
g
Da
ta
fr
o
m
Sla
v
e
D0
D1
D2
D3
D4
D5
D6
D7
ACK
R/W
=
1
T
ra
n
smi
t A
ddr
ess to S
lave
SSPI
F
BF
AC
K
i
s
not
sent
W
rit
e
t
o
SS
PCO
N
2
<
0
>
(SEN =
1
),
W
ri
te
to S
S
P
B
U
F occu
rs her
e,
A
C
K f
ro
m
Sl
a
v
e
M
a
ster
confi
g
ured
as a r
e
cei
v
er
b
y
pro
g
ram
m
ing
S
S
P
C
ON
2<
3>
(R
C
E
N
=
1
)
PE
N b
it
=
1
w
ri
tte
n her
e
D
a
ta
sh
if
ted i
n
o
n
fal
ling
edge o
f C
L
K
C
lear
ed i
n
so
ftw
are
st
art X
M
IT
SEN =
0
SSPO
V
SDA =
0
, S
C
L
=
1
wh
ile
CP
U
(S
S
PST
A
T
<0
>)
AC
K
Cle
a
re
d
in
so
ft
w
a
re
C
lea
re
d i
n
s
o
ft
w
ar
e
S
e
t S
S
P
IF
in
terr
upt
at en
d of r
e
cei
v
e
Se
t P b
it
(SSP
ST
A
T
<4
>)
an
d S
S
P
IF
A
C
K
fro
m
ma
ster
Se
t SS
PI
F a
t e
n
d
S
e
t S
S
P
IF
inter
rup
t
at
end o
f A
cknow
ledge
se
quence
Se
t SS
PI
F in
te
rr
u
p
t
at e
nd of
A
ckno
w
-
ledge
seque
nce
of r
e
ceive
S
e
t A
C
K
E
N
, st
ar
t A
cknow
ledg
e sequ
ence
S
D
A = ACK
D
T =
1
RCEN cle
a
re
d
a
u
tom
a
tically
RCEN =
1,
st
ar
t
ne
xt r
e
ce
ive
W
ri
te to
S
S
P
C
ON
2<
4>
to st
ar
t A
cknow
ledge
seque
nce
SD
A = ACK
D
T (
SSP
CO
N2
<5
>)
=
0
RCEN cle
a
re
d
a
u
tom
a
tically
re
spon
ds to S
S
P
IF
ACKEN
be
gi
n S
tart
C
ondi
ti
on
C
lear
ed i
n
so
ftw
are
SDA = A
C
KDT
=
0
C
lear
ed i
n
soft
w
a
re
S
S
P
O
V
i
s
set
beca
u
se
S
SPB
UF
is still fu
ll
La
st bit is shifte
d into
S
S
P
S
R an
d
con
tent
s ar
e unl
oa
ded i
n
to S
S
P
B
U
F