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EM78P157NAKM

8-Bit Microcontroller with OTP ROM

ELAN Microelectronics 

EM78P157N

8-Bit Microcontroller with OTP ROM

3.2 Pin Descriptions

3.2.1 EM78P157NBP and EM78P157NBM Pin Descriptions

Symbol Pin No.

VDD

10

OSCI

12

OSCO

11

TCC

3

/RESET

4

P50~P53

13, 14,

1, 2

P60~P61 6~7

P66~P67 8~9

/INT

6

VSS

5

Type

–

I

I/O

I

I

I/O

I/O

I/O

I

–

Function

y Power supply

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

y ERC type: RC oscillator input pin

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

y RC type: Instruction clock output

y External clock signal input

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

to VDD or VSS if not in use

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

will also remain at reset condition.

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

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

y P50~P52 can be set as pull-down by software

y P60~P61 are bi-directional I/O pins

y These pins can be set as pull-high, pull-down, or open-drain through

software programming

y P66~P67 are bi-directional I/O pins

y These pins can be set as pull-high or open-drain through software

programming

y External interrupt pin triggered by falling edge

y Ground

3.2.2 EM78P157NAP and EM78P157NAM Pin Descriptions

Symbol Pin No.

VDD

14

OSCI

16

OSCO

15

TCC

3

/RESET

4

P50~P53

17,18,

1, 2

P60~P67 6~13

/INT

6

VSS

5

Type

–

I

I/O

I

I

I/O

I/O

I

–

Function

y Power supply

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

y ERC type: RC oscillator input pin

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

y RC type: Instruction clock output

y External clock signal input

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

VDD or VSS if not in use

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

will also remain at reset condition.

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

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

y P50~P52 can be set as pull-down by software

y P60~P67 are bi-directional I/O pins

y These pins can be set as pull-high or open-drain through software

programming

y P60~P63 can also be set as pull-down by software

y External interrupt pin triggered by falling edge

y Ground

Product Specification (V1.0) 09.22.2005

•3

(This specification is subject to change without further notice)

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