EM78P447N datasheet(24/57 Pages) EMC

Part #	EM78P447N

Description	8-BIT MICRO-CONTROLLER

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Manufacturer	EMC [ELAN Microelectronics Corp]

Direct Link	http://www.emc.com.tw

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EM78P447N

OTP ROM

INT

ENI/DISI

IOD

RFWR

IOCFRD

IOCFWR

IRQn

IRQm

RFRD

IOCF

/RESET

/IRQn

VCC

RF

CLK

Q

D

P

R

L

C

_

P

R

L

C

Q

_

D

Fig. 9 Interrupt Input Circuit

4.7 Oscillator

1. Oscillator Modes

The EM78P447N can operate in three different oscillator modes, i.e., high XTAL (HXT) oscillator

mode, low XTAL (LXT) oscillator mode, and External RC oscillator mode (ERC) oscillator mode.

User can select one of them by programming MS, HLF and HLP in the Code Option Register. Table

7 depicts how these three modes are defined.

The maximum limit for operational frequencies of crystal/resonator under different VDDs is listed in

Table 8.

Table 7 Oscillator Modes Defined by MS and HLP

Mode

MS

HLF

HLP

ERC(External RC oscillator mode)

0

*X

HXT(High XTAL oscillator mode)

1

*X

LXT(Low XTAL oscillator mode)

1

0

<Note>

1. X, Don’t care

2. The transient point of system frequency between HXT and LXY is around 400 KHz.

This specification is subject to change without prior notice.

10.21.2004 (V1.0)

24

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EM78P447N Datasheet(PDF) 24 Page - ELAN Microelectronics Corp

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