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EM78P157NBP

8-Bit Microcontroller with OTP ROM

ELAN Microelectronics 

EM78P157N

8-Bit Microcontroller with OTP ROM

3.2.3 EM78P157NAAS Pin Descriptions

Symbol Pin No. Type

VDD

15

–

OSCI

17

I

OSCO

16

I/O

TCC

4

I

/RESET

5

I

P50~P53

18, 19,

2, 3

I/O

P60~P67 7~14

I/O

/INT

7

I

VSS

6

–

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

3.2.4 EM78P157NAKM Pin Descriptions

Symbol Pin No. Type

VDD

15,16

–

OSCI

18

I

OSCO

17

I/O

TCC

3

I

/RESET

4

I

P50~P53 19, 20, 1, 2 I/O

P60~P67 7~14

I/O

/INT

7

I

VSS

5, 6

–

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

4•

Product Specification (V1.0) 09.22.2005

(This specification is subject to change without further notice)

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