EM78P159NP datasheet(16/48 Pages) EMC

16 / 48 page

EM78P159N

8-Bit Microcontrollerwith OTP ROM

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Product Specification (V1.0) 03.10.2006

(This specification is subject to change without further notice)

4.2.3 IOC5 ~ IOC6 (I/O Port Control Register)

"1" put the relative I/O pin into high impedance, while "0" defines the relative I/O pin

as output.

Only the lower 7 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)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

/PD7

/PD6

/PD5

/PD4

/PD3

/PD2

/PD1

/PD0

Bit 0 (/PD0):

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

= Enable internal pull-down

= 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 (/PD3):

Control bit is used to enable the pull-down of P53 pin.

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.

EM78P159NP Datasheet(PDF) 16 Page - ELAN Microelectronics Corp

EM78P159NP Datasheet(HTML) 16 Page - ELAN Microelectronics Corp

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