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Renesas PROM Programming Adapters PCA7438F-64A Spezifikationen Seite 25

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Seitenansicht 24
Rev.2.40 Jun 14, 2004 page 25 of 56
38C1 Group
Serial I/O
The serial I/O function can be used only for clock synchronous se-
rial I/O.
For clock synchronous serial I/O, the transmitter and the receiver
must use the same clock. When the internal clock is used, transfer
is started by a write signal to the serial I/O register.
[Serial I/O Control Register (SIOCON)] 001D16
The serial I/O control register contains 8 bits which control various
serial I/O functions.
■ Notes on Serial I/O
Write data to the serial I/O register only when the SCLK pin is “H”.
Fig. 22 Structure of serial I/O control register
Fig. 23 Block diagram of serial I/O function
"1"
"0"
"0"
"1"
"0"
"1"
S
CLK
1/8
1/16
1/32
1/64
1/128
1/256
P5
4
/S
IN
P5
6
/S
CLK
P5
5
/S
OUT
P5
7
/S
RDY
(Note)
φ
SOURCE
Data bus
Serial I/O
interrupt request
Serial I/O port selection bit
Serial I/O counter (3)
Serial I/O register (8)
Synchronous circuit
Synchronous clock
selection bit
External clock
Internal synchronous
clock select bits
Divider
P5
6
latch
P5
5
latch
Note: It is selected by the synchronous clock selection bit, the
S
RDY
output selection bit, and the serial I/O port selection
bit.
P5
7
latch
(Note)
S
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r
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Note: φ
SOURCE
represents the oscillation frequency of
X
IN
input in the middle- and high-speed mode,
on-chip oscillator in the on-chip oscillator mode,
and sub-clock in the low-speed mode.
S
R
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:
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f
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:
M
S
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P
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5
/
S
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P
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h
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:
C
M
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t
p
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t
(
i
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)
1
:
N
-
c
h
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d
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)
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b
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t
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:
I
/
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p
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t
1
:
S
O
U
T
,
S
C
L
K
s
i
g
n
a
l
o
u
t
p
u
t
0
0
0
:
f
(
X
I
N
)
/
8
(
S
I
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C
O
N
:
a
d
d
r
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s
s
0
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1
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1
6
,
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)
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:
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(
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I
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)
/
2
5
6
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:
f
(
X
I
N
)
/
1
2
8
1
0
1
:
1
0
0
:
0
1
1
:
f
(
X
I
N
)
/
6
4
0
1
0
:
f
(
X
I
N
)
/
3
2
0
0
1
:
f
(
X
I
N
)
/
1
6
Seitenansicht 24
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