EM78P257AP datasheet(65/91 Pages) EMC

65 / 91 page

EM78P257

OTP ROM

This specification is subject to change without prior notice.

07.27.2004 (V1.4)

Interrupt to CPU

Software time

Number of pulses = 3

Low-time Register = 3

start

Fosc

Fosco

IR OUT

CASE 1

CASE 2

Fig. 29 CASE 1 shows a typical long pulse(DP=00;MF=10;HF=1;LGP=1;PWM=0); CASE 2 shows

the same long pulse after being modulated with a frequency of 1/4Fosc

(DP=00;MF=10;HF=1;LGP=1;PWM=0).

Low -time Register = 3

start

Fosc

Fosco

IR OUT

High -time Register = 2

Fig. 30 Continuous pulse train (DP=00;MF=10;HF=0;LGP=0;PWM==1).

4.13 CODE OPTION

EM78P257A/B has one CODE option word and one Customer ID word, which are not a part of the normal

program memory.

Word 0

Word 1

Bit12~Bit0

Code option12~0

Customer’s ID

1. Code Option Register (Word 0)

Bit12

Bit11

Bit10

Bit9

Bit8

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

/RESETEN

/ENWDT

CLKS

OSC2

OSC1

OSC0

/PTB

SUT

TYP

RCOUT

RCM1

RCM0

• Bit 12 (/RESETEN): Define Pin4(EM78P257A) or Pin5(EM78P257B) as a reset pin

0: /RESET enable

1: /RESET disable

• Bit 11 (/ENWDT): Watchdog timer enable bit.

EM78P257AP Datasheet(PDF) 65 Page - ELAN Microelectronics Corp

EM78P257AP Datasheet(HTML) 65 Page - ELAN Microelectronics Corp

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