EM78156EAS datasheet(13/48 Pages) EMC

13 / 48 page

EM78156E

8-Bit Microcontroller with MASK ROM

Product Specification (V1.3) 07.29.2004

• 9

(This specification is subject to change without further notice)

Only the lower 4 bits of IOC5 can be defined.

IOC5 and IOC6 registers are both readable and writable.

4.2.4 IOCA (Prescaler Counter Register)

IOCA register is readable.

The value of IOCA is equal to the contents of Prescaler counter.

Down counter.

4.2.5 IOCB (Pull-down Control Register)

/PD7

/PD6

/PD5

/PD4

/PD2

/PD1

/PD0

Bit 0 (/PD0)

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

0: Enable internal pull-down

1: Disable internal pull-down

Bit 1 (/PD1)

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

Bit 2 (/PD2)

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

Bit 3

Not used.

Bit 4 (/PD4)

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

Bit 5 (/PD5)

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

Bit 6 (/PD6)

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

Bit 7 (/PD7)

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

IOCB Register is both readable and writable.

4.2.6 IOCC (Open-drain Control Register)

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 is used to enable the open-drain of P61 pin.

Bit 2 (OD2)

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

Bit 3 (OD3)

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

Bit 4 (OD4)

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

Bit 5 (OD5)

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

EM78156EAS Datasheet(PDF) 13 Page - ELAN Microelectronics Corp

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