EM78156EAS datasheet(7/48 Pages) EMC

7 / 48 page

EM78156E

8-Bit Microcontroller with MASK ROM

Product Specification (V1.3) 07.29.2004

• 3

(This specification is subject to change without further notice)

Table 2 EM78156EAS Pin Description

Symbol

Pin No.

Type

Function

VDD

■ Power supply.

OSCI

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

■ ERC 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 keep 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 also 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 be pulled-down also by software.

/INT

■ External interrupt pin triggered by falling edge.

VSS

■ Ground.

Table 3 EM78156EKM Pin Description

Symbol

Pin No.

Type

Function

VDD

15,16

■ Power supply.

OSCI

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

■ ERC 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

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

■ External interrupt pin triggered by falling edge.

VSS

5, 6

■ Ground.

EM78156EAS Datasheet(PDF) 7 Page - ELAN Microelectronics Corp

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