EM78P468NBQ datasheet(39/82 Pages) EMC

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EM78P468N

8-BIT Microcontroller

Product Specification (V1.2) 03.15.2005

• 35

(This specification is subject to change without further notice)

4.6

lla

4.6

Table 3 Oscillator Modes as defined by FSMD, FMMD1, FMMD0.

Osci

tor

Oscillator Modes

This LSI can operate in the three different oscillator modes from main oscillator (R-OSCI,

OSCO), such as RC oscillator with external resistor and Internal capacitor mode (ERIC);

crystal oscillator mode; and PLL operation mode (R-OSCI connected 0.01

μF capacitor to

Ground). User can select one of them by programming FMMD1 and FMMD0 in the

CODE options register. The sub-oscillator can be operated in crystal mode and ERIC

mode. Table 3 below shows how these three modes are defined.

FSMD

FMMD1

FMMD0

Main clock

Sub-clock

RC type (ERIC)

Crystal type

RC type (ERIC)

PLL type

RC type (ERIC)

Crystal type

al type

Cryst

stal type

PLL type

Cry

Table 4 Summary of maximum operating speeds

Conditions

VDD

Fxt max.(MHz)

2.3

3.0

Two clocks

5.0

4.6

req

ine

oscillator. We can

choose RD register to change high oscilla

ncy.

ion b

frequency (Fm) and

shown

able:

Phase Lock Loop (PLL Mode)

hen operate on PL mode, the High f

uency determ

d by sub-

tor freque

The relat

etween hig

sub-oscillator is

as below t

Xout

Xin

XTAL

R-OSCI

EM78P468N

0.01

Circuit for PLL mode

EM78P468NBQ Datasheet(PDF) 39 Page - ELAN Microelectronics Corp

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