EM78P156ELKM datasheet(7/55 Pages) EMC

Part #	EM78P156ELKM

Description	8-BIT MICRO-CONTROLLER

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Manufacturer	EMC [ELAN Microelectronics Corp]

Direct Link	http://www.emc.com.tw

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EM78P156EL

OTP ROM

Table 2 EM78P156ELAS Pin Description

Symbol

Pin No.

Type

Function

VDD

15

-

* Power supply.

OSCI

17

I

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

* ERC type: RC oscillator input pin.

OSCO

16

I/O

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

* RC type: Instruction clock output.

* External clock signal input.

TCC

4

I

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

VDD or VSS if not in use.

/RESET

5

I

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

will also remain in reset condition.

P50~P53

18, 19,

2, 3

I/O

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

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

* P50~P52 can be pulled-down by software.

P60~P67

7~14

I/O

* 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.

/INT

7

I

* External interrupt pin triggered by falling edge.

VSS

6

-

* Ground.

Table 3 EM78P156ELKM Pin Description

Symbol

Pin No.

Type

Function

VDD

15,16

-

* Power supply.

OSCI

18

I

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

* ERC type: RC oscillator input pin.

OSCO

17

I/O

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

* 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

4

I

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

will also remain in reset condition.

P50~P53

19, 20,

1, 2

I/O

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

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

* P50~P52 can be pulled-down by software.

P60~P67

7~14

I/O

* 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.

/INT

7

I

* External interrupt pin triggered by falling edge.

VSS

5, 6

-

* Ground.

This specification is subject to change without prior notice.

07.29.2004 (V1.3)

7

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