EM78P156EL Просмотр технического описания (PDF) - Elan Microelectronics Corp

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производитель

EM78P156EL

8-BIT MICRO-CONTROLLER

Elan Microelectronics Corp 

EM78P156EL

OTP ROM

VCC

/IRQn

D

P

R

Q

CLK

_

CQ

L

RF

/RESET

RFRD

IRQn

IRQm

Q

_

IOCF Q

P

R

D

CLK

C

L

IOCFWR

IOCFRD

INT

ENI/DISI

IOD

RFWR

4.7 Oscillator

Fig. 10 Interrupt Input Circuit

1. Oscillator Modes

The EM78P156EL can be operated in three different oscillator modes, such as External RC oscillator

mode (ERC), High XTAL oscillator mode (HXT), and Low XTAL oscillator mode (LXT). User can

select one of them by programming MS and HLF in the CODE option register. Table 8 depicts how

these three modes are defined.

The up-most limited operation frequency of crystal/resonator on the different VDDs is listed in Table

9.

Table 8 Oscillator Modes Defined by MS and HLP

Mode

MS

ERC(External RC oscillator mode)

0

HXT(High XTAL oscillator mode)

1

LXT(Low XTAL oscillator mode)

1

HLF

HLP

*X

*X

1

*X

0

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.

26

07.29.2004 (V1.3)

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