EM78P447SBWM datasheet(7/55 Pages) EMC

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EM78P447S

OTP ROM

Table 2 EM78P447SAS Pin Description

Symbol Pin No.

Type

Function

VDD

* Power supply.

OSCI

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

* RC type: RC oscillator input pin.

OSCO

I/O

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

* RC type: Instruction clock output.

* External clock signal input.

TCC

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

VDD or VSS if not in use.

/RESET

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

will also remain in reset condition.

P50~P53

5~8

I/O

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

P60~P67

9~13,

15~17

I/O

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

by software control.

P70~P77 18~25

I/O

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

* 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

* External interrupt pin triggered by falling edge.

VSS

1,14

* Ground.

Table 3 EM78P447SBP and EM78P447SBWM Pin Description

Symbol

Pin No.

Type

Function

VDD

* Power supply.

OSCI

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

* RC type: RC oscillator input pin.

OSCO

I/O

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

pin.

* RC type: Instruction clock output.

* External clock signal input.

TCC

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

to VDD or VSS if not in use.

/RESET

* 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,

32~31

I/O

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

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

20~27

I/O

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

* 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

* External interrupt pin triggered by falling edge.

VSS

* Ground.

* No connection.

This specification is subject to change without prior notice.

06.25.2003 (V1.1)

EM78P447SBWM Datenblatt(PDF) 7 Page - ELAN Microelectronics Corp

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