WT6132/WT6124/WT6116

Data Sheet Rev. 1.01

Weltrend Semiconductor, Inc.

Page 7

Port A Control Register

Name

Addr R/W Initial

Bit 7

Bit 6

Bit 5

Bit4

Bit 3

Bit 2

Bit 1

Bit 0

PA_CTRL 0000h W

00h

PA7OE

PA6OE

PA5OE

PA4OE

PA3OE

PA2OE

PA1OE

PA0OE

Bit Name

Description

PAnOE

Port An Output Enable.

When it is set, PAn is output pin.

When it is cleared, PAn is input pin with internal pull high (except PA0 and PA1 pins).

Port A Data Register

Name

Addr

R/W Initial

Bit 7

Bit 6

Bit 5

Bit4

Bit 3

Bit 2

Bit 1

Bit 0

R

00h

PA7

PA6

PA5

PA4

PA3

PA2

PA1

PA0

PA_DATA 0001h

W

00h

PA7

PA6

PA5

PA4

PA3

PA2

PA1

PA0

Bit Name

Description

PAn (W)

This bit controls the output level when the corresponding PAnOE bit is set.

When PAn=1, PAn pin outputs high level. (PA0 and PA1 are open-drain output)

When PAn=0, PAn pin outputs low level.

PAn (R)

When PAnOE=1 (i.e. output port), this bit is same as PAn (W).

When PAnOE=0, this bit indicates the input level. “1” means high and “0” means low.

I/O Port B

I/O Port B is shared with some special functions. When the special function is disabled, it is an general

I/O port and is same as Port A2. If it is configured as an output, it can source/sink 6mA. If it is configured

as an input, it has an internal pull-up resistor.

Port B Control Register

Name

Addr

R/W Initial

Bit 7

Bit 6

Bit 5

Bit4

Bit 3

Bit 2

Bit 1

Bit 0

PB_CTRL 0002h

W

00h

--

--

PB5OE

PB4OE

PB3OE

PB2OE

PB1OE

PB0OE

Bit Name

Description

PBnOE

Port Bn Output Enable.

When it is set, PBn is output pin.

When it is cleared, PBn is input pin with internal pull high

Port B Data Register

Name

Addr

R/W Initial

Bit 7

Bit 6

Bit 5

Bit4

Bit 3

Bit 2

Bit 1

Bit 0

R

00h

--

--

PB5

PB4

PB3

PB2

PB1

PB0

PB_DATA 0003h

W

00h

--

--

PB5

PB4

PB3

PB2

PB1

PB0

Bit Name

Description

PBn (W)

This bit controls the output level when the corresponding PBnOE bit is set.

When PBn=1, PBn pin outputs high level.

When PBn=0, PBn pin outputs low level.

PBn (R)

When PBnOE=1 (i.e. output port), this bit is same as PBn (W).

When PBnOE=0, this bit indicates the input level. “1” means high and “0” means low.