EM78P257 datasheet(8/91 Pages) EMC

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EM78P257

OTP ROM

This specification is subject to change without prior notice.

07.27.2004 (V1.4)

* 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

18,19

3,2

8,9

13,12

20,1

10,11

* “-“ -> 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

8,13

20,19

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

5,6

Ground.

P52/CO2

P53/CIN2+

P54/CIN2-/TCC

P71//RESET

Vss

P60//INT

P61/CIN3-/TCC1

P62/CIN3+

P63/CO3

P56/TCC5

P55/CIN1-/OSCI

P70/OSCO

VDD

P67/IR OUT

P65/CIN4+

P64/CO4

P66/CIN4-/TCC2

P50/CIN1+/TCC4

P51/CO1/TCC3

P57/TCC6

Fig. 2 Pin Assignment - EM78P257BP/BM

Table 3 Pin Description-EM78P257BP/BM/BKM

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.

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