Renesas PROM Programming Adapter PCA7408 Manuel d'utilisateur télécharger pdf (Page 29)

M37221M4H/M6H/M8H/MAH–XXXSP/FP M37221EASP/FP

Rev.1.00 Oct 01, 2002 page 29 of 110

REJ03B0134-0100Z

Fig. 8.5.3 Serial I/O Mode Register

b

7b

6 b

5b

4b

3 b

2b

1b0

S

e

r

i

a

l

I

/

O

m

o

d

e

r

e

g

i

s

t

e

r

(

S

M

)

[

A

d

d

r

e

s

s

0

0

D

C

1

6]

BName F

u

n

c

t

i

o

n

s

S

e

r

i

a

l

I

/

O

M

o

d

e

R

e

g

i

s

t

e

r

0

,

1I

n

t

e

r

n

a

l

s

y

n

c

h

r

o

n

o

u

s

c

l

o

c

k

s

e

l

e

c

t

i

o

n

b

i

t

s

(

S

M

0

,

S

M

1

)

b

1

b

0

0

0

:

f

(

XI

N)

/

4

0

1

:

f

(

X

I

N)

/

1

6

1

0

:

f

(

X

I

N)

/

3

2

1

1

:

f

(

X

I

N)

/

6

4

2

S

y

n

c

h

r

o

n

o

u

s

c

l

o

c

k

s

e

l

e

c

t

i

o

n

b

i

t

(

S

M

2

)

3

Serial I/O port

selection bit (SM3)

6

5

T

r

a

n

s

f

e

r

d

i

r

e

c

t

i

o

n

s

e

l

e

c

t

i

o

n

b

i

t

(

S

M

5

)

0: P2

0, P21

1: SCLK, SOUT

0: External clock

1: Internal clock

0: LSB first

1: MSB first

4

Fix this bit to “0.”

7

N

o

t

h

i

n

g

i

s

a

s

s

i

g

n

e

d

.

T

h

i

s

b

i

t

i

s

a

w

r

i

t

e

d

i

s

a

b

l

e

b

i

t

.

W

h

e

n

t

h

i

s

b

i

t

i

s

r

e

a

d

o

u

t

,

t

h

e

v

a

l

u

e

i

s

“

0

.

”

A

f

t

e

r

r

e

s

e

t

RW

0

0

0

0

0

0RW

RW

RW

R

W

RW

RW

0R

—

S

e

r

i

a

l

i

n

p

u

t

p

i

n

s

e

l

e

c

t

i

o

n

b

i

t

(

S

M

6

)

0

:

I

n

p

u

t

s

i

g

n

a

l

f

r

o

m

S

I

N

p

i

n

.

1

:

I

n

p

u

t

s

i

g

n

a

l

f

r

o

m

S

O

U

T

p

i

n

.

0

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