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EM78P159NP

8-Bit Microcontroller with OTP ROM

ELAN Microelectronics 

EM78P159N

8-Bit Microcontrollerwith OTP ROM

3.1 EM78P159NP and EM78P159NM Pin Description

Symbol

VDD

Pin No. Type

14

-

P56/OSCI

16

I/O

P55/OSCO 15

I/O

P54/TCC

3

I/O

/RESET

4

I

P50 ~ P53

17, 18,

1, 2

I/O

P60 ~ P67 6 ~ 13 I/O

/INT

VSS

6

I

5

-

Function

■ Power supply

■ General-purpose I/O pin

■ XTAL type: Crystal input terminal or external clock input pin

■ ERC type: RC oscillator input pin

■ General-purpose I/O pin

■ XTAL type: Output terminal for crystal oscillator or external clock input pin

■ RC type: Instruction clock output

■ External clock signal input

■ General-purpose I/O pin

■ The real time clock/counter (with Schmitt trigger input pin), must be tied to

VDD or VSS if not in use.

■ Input pin with Schmitt trigger. If this pin remains at logic low, the controller

will also remain in reset condition.

■ P50 ~ P53 are bi-directional I/O pins.

■ P50 and P51 can also be defined as the R-option pins

■ P50 ~ P53 can be pulled-down by software

■ P60 ~ P67 are bi-directional I/O pins.

■ These can be pulled-high or can be open-drain by software programming

■ P60 ~ P63 can also be pulled-down by software

■ External interrupt pin triggered by falling edge

■ Ground

3-2 EM78P159NAS Pin Description

Symbol

VDD

Pin No. Type

15

-

P56/OSCI

17

I/O

P55/OSCO

16

I/O

P54/TCC

4

I/O

/RESET

P50~P53

5

I

18, 19,

2, 3

I/O

P60~P67

/INT

VSS

7~14 I/O

7

I

6

-

Function

■ Power supply.

■ General-purpose I/O pin

■ XTAL type: Crystal input terminal or external clock input pin

■ ERC type: RC oscillator input pin

■ General-purpose I/O pin

■ XTAL type: Output terminal for crystal oscillator or external clock input pin

■ RC type: Instruction clock output

■ External clock signal input

■ General-purpose I/O pin

■ The real time clock/counter (with Schmitt trigger input pin), must be tied to

VDD or VSS if not in use.

■ Input pin with Schmitt trigger. If this pin remains at logic low, the controller

will also remain in reset condition.

■ P50 ~ P53 are bi-directional I/O pins

■ P50 and P51 can also be defined as the R-option pins

■ P50 ~ P53 can be pulled-down by software

■ P60 ~ P67 are bi-directional I/O pins.

■ These can be pulled-high or can be open-drain by software programming

■ P60 ~ P63 can also be pulled-down by software

■ External interrupt pin triggered by falling edge

■ Ground

4•

Product Specification (V1.0) 03.10.2006

(This specification is subject to change without further notice)

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