EM78P156E Ver la hoja de datos (PDF) - ELAN Microelectronics

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EM78P156E

8-bit CMOS microprocessor, 1K13-bit (OTP-ROM), 2.3V~5.5V

ELAN Microelectronics 

EM78P156E

5. IOCB (Pull-down Control Register)

7

/PD7

6

/PD6

5

/PD5

4

/PD4

3

2

-

/PD2

Bit 0 (/PD0)

Control bit used to enable the pull-down of P50 pin.

0: Enable internal pull-down

1: Disable internal pull-down

Bit 1 (/PD1)

Control bit used to enable the pull-down of P51 pin.

Bit 2 (/PD2)

Control bit used to enable the pull-down of P52 pin.

Bit 3

Not used.

Bit 4 (/PD4)

Control bit used to enable the pull-down of P60 pin.

Bit 5 (/PD5)

Control bit used to enable the pull-down of P61 pin.

Bit 6 (/PD6)

Control bit used to enable the pull-down of P62 pin.

Bit 7 (/PD7)

Control bit used to enable the pull-down of P63 pin.

• IOCB register is both readable and writable.

6. IOCC (Open-drain Control Register)

1

/PD1

0

/PD0

7

6

5

4

3

2

1

0

OD7

OD6

OD5

OD4

OD3

OD2

OD1

OD0

Bit 0 (OD0) Control bit used to enable the open-drain of P60 pin.

0: Disable open-drain output

1: Enable open-drain output

Bit 1 (OD1)

Control bit used to enable the open-drain of P61 pin.

Bit 2 (OD2)

Control bit used to enable the open-drain of P62 pin.

Bit 3 (OD3)

Control bit used to enable the open-drain of P63 pin.

Bit 4 (OD4)

Control bit used to enable the open-drain of P64 pin.

Bit 5 (OD5)

Control bit used to enable the open-drain of P65 pin.

Bit 6 (OD6)

Control bit used to enable the open-drain of P66 pin.

Bit 7 (OD7)

Control bit used to enable the open-drain of P67 pin.

• IOCC register is both readable and writable.

7. IOCD (Pull-high Control Register)

7

/PH7

6

/PH6

5

/PH5

4

/PH4

3

/PH3

2

/PH2

1

/PH1

0

/PH0

Bit 0 (/PH0)

Control bit used to enable the pull-high of P60 pin.

0: Enable internal pull-high

1: Disable internal pull-high

Bit 1 (/PH1)

Control bit used to enable the pull-high of P61 pin.

Bit 2 (/PH2)

Control bit used to enable the pull-high of P62 pin.

Bit 3 (/PH3)

Bit 4 (/PH4)

Control bit used to enable the pull-high of P63 pin.

Control bit used to enable the pull-high of P64 pin.

Bit 5 (/PH5)

Control bit used to enable the pull-high of P65 pin.

* This specification is subject to be changed without notice. 8.11.1999

B3-7

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