16-Port I/O Expander with LED Intensity

Control, Interrupt, and Hot-Insertion Protection

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15

Table 4. Configuration Register (continued)

REGISTER DATA

REGISTER

ADDRESS

CODE

(HEX)

D7

D6

D5

D4

D3

D2

D1

D0

CONFIGURATION

R/

W

Write device configuration

0

X

Read back device configuration

1

INT

O

O1

O0

I

G

B

E

Disable global intensity control—intensity

is set by registers 0x10–0x17 for ports P0

through P15 when configured as outputs,

and by D3–D0 of register 0x0E for

INT/O16 when INT/O16 pin is configured

as an output port

—

X

X

XXX

0

XX

Enable global intensity control—intensity

for all ports configured as outputs is set

by D3–D0 of register 0x0E

—

X

X

XXX

1

XX

Disable data change interrupt—INT/O16

output is controlled by the O0 and O1 bits

—

XX

X

X

0

XXX

Enable data change interrupt—INT/O16

output is controlled by port input data

change

—

XX

X

X

1

XXX

INT/O16 output is low (blink is disabled)

—

XX

X

00

XX

0

INT/O16 output is high impedance (blink

is disabled)

—

XX

X

10

XX

0

INT/O16 output is low during blink phase 0

—

XX

X

00

XX

1

INT/O16 output is high impedance during

blink phase 0

—

XX

X

10

XX

1

INT/O16 output is low during blink phase 1

—

XX

0

X

0

XX

1

INT/O16 output is high impedance during

blink phase 1

—

XX

1

X

0

XX

1

Read-back data change interrupt status

—data change is not detected, and

INT/O16 output is high when interrupt

enable (I bit) is set

1

00

XXX

XXX

Read-back data change interrupt status

—data change is detected, and INT/O16

output is low when interrupt enable (I bit)

is set

1

0x0F

10

XXX

XXX

X = Don’t care.