EM78P447N

8-Bit Microcontroller with OTP ROM

Table 3 EM78P447NBP and EM78P447NBWM Pin Description

Symbol

Pin No.

Type

Function

VDD

4

-

■ Power supply.

OSCI

29

I

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

■ RC type: RC oscillator input pin.

 

 

 

 

 

 

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

OSCO

28

I/O

■ RC type: Instruction clock output.

 

 

 

■ External clock signal input.

TCC

3

I

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

VDD or VSS if not in use.

 

 

 

/RESET

30

I

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

will keep in reset condition.

 

 

 

P50~P57

8~11,2~1,

I/O

■ P50~P57 are bi-directional I/O pins.

 

32~31

 

 

P60~P67

12~19

I/O

■ P60~P67 are bi-directional I/O pins. These can be pulled -high internally by

software control.

 

 

 

 

 

 

■ P70~P77 are bi-directional I/O pins.

P70~P77

20~27

I/O

■ P74~P75 can be pulled-high internally by software control.

■ P76~P77 can have open-drain output by software control.

 

 

 

 

 

 

■ P70 and P71 can also be defined as the R-option pins.

/INT

7

I

■ External interrupt pin triggered by falling edge.

VSS

6

-

■ Ground.

NC

5

-

■ No connection.

Table 4 EM78P447NCK and EN78P447NCM Pin Description

Symbol

 

Pin No.

 

Type

 

Function

 

VDD

 

3

 

-

 

■ Power supply.

OSCI

 

23

 

I

 

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

 

 

 

■ RC type: RC oscillator input pin.

 

 

 

 

 

 

 

 

 

 

 

 

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

OSCO

 

22

 

I/O

 

■ RC type: Instruction clock output.

 

 

 

 

 

 

■ External clock signal input.

TCC

 

2

 

I

 

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

 

 

 

VDD or VSS if not in use.

 

 

 

 

 

 

/RESET

 

24

 

I

 

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

 

 

 

will also remain in reset condition.

 

 

 

 

 

 

P50~P54

 

6~9,1

 

I/O

 

■ P50~P54 are bi-directional I/O pins.

P60~P67

 

10~17

 

I/O

 

■ P60~P67 are bi-directional I/O pins. These can be pulled-high internally by

 

 

 

software control.

 

 

 

 

 

 

 

 

 

 

 

 

■ P74~P77 are bi-directional I/O pins.

P74~P77

 

18~21

 

I/O

 

■ P74~P75 can be pulled-high internally by software control.

 

 

 

 

 

 

■ P76~P77 can have open-drain output by software control.

/INT

 

5

 

I

 

■ External interrupt pin triggered by falling edge.

VSS

 

4

 

-

 

■ Ground.

NC

 

3

 

-

 

■ No connection.

Product Specification (V1.1) 03.30.2005

5

(This specification is subject to change without further notice)

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IBM manual EM78P447NBP and EM78P447NBWM Pin Description, EM78P447NCK and EN78P447NCM Pin Description, Power supply