EM78P257AP datasheet(7/91 Pages) EMC

7 / 91 page

EM78P257

OTP ROM

This specification is subject to change without prior notice.

07.27.2004 (V1.4)

Table 1 Pin Description- EM78P257AP/AM

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: clock output with a duration of one instruction cycle.

* External clock signal input.

P70~P71

4,15

I/O

* General purpose I/O pin. (P71 is input pin only)

* Default value after a power on reset.

P60~P67

6~13

I/O

* General purpose I/O pin.

* Open_drain

* Default value after a power on reset.

P50~P55

1~3

16~18

I/O

* General purpose I/O pin.

* Pull_high/pull_down.

* Wake up from sleep mode when the status of the pin changes.

* Default value after a power on reset.

IR OUT

* IR mode output pin, capable of sinking 20mA

/INT

* External interrupt pin triggered by falling edge.

CIN1-,CIN1+

CIN2-,CIN2+

CIN3-,CIN3+

CIN4-,CIN4+

CO1,CO2

CO3,CO4

16,17

3,2

7,8

12,11

18,1

9,10

* “-“ -> the input pin of Vin- of a comparator.

* “+”-> the input pin of Vin+ of a comparator.

* Pin CO1~4 are the outputs of the comparators.

TCC

TCC1,TCC2,

TCC3,TCC4

,7,12

18,17

* External Counter input.

/RESET

* If set as /RESET and remains at logic low, the device will be reset.

* Voltage on /RESET/Vpp must not exceed Vdd during the normal

mode.

* Pull_high is on if defined as /RESET.

VSS

Ground.

Table 2 Pin Description- EM78P257AKM

Symbol

Pin No.

Type

Function

VDD

15,16

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: clock output with a duration of one instruction cycle.

* External clock signal input.

P70,P71

17,4

I/O

* General purpose I/O pin. (P71 is input pin only)

* Default value after a power on reset.

P60~P67

7~14

I/O

* General purpose I/O pin.

* Open_drain.

* Default value after a power on reset.

P50~P55

1~3

18~20

I/O

* General purpose I/O pin.

* Pull_high/pull_down.

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