MCS11 datasheet(34/108 Pages) PADAUK

34 / 108 page

MCS11

ADC-Type Enhanced FPPA

TM Controller

Page 34 of 108

PDK-DS-MCS11_v020 – Apr. 20, 2018

5-7-4. Crystal Oscillator

If crystal oscillator is used, a crystal or resonator is required between X1 and X2. Fig. 5-7-1 shows the

hardware connection under this application; the range of operating frequency of crystal oscillator can be

from 32 KHz to 4MHz, depending on the crystal placed on; higher frequency oscillator than 4MHz is

NOT supported.

Fig. 5-7-1 Connection of crystal oscillator

Besides crystal, external capacitor and options of MCS11 should be fine tuned in eoscr (0x0b) register

to have good sinusoidal waveform. The eoscr.7 is used to enable crystal oscillator module, eoscr.6 and

eoscr.5 are used to set the different driving current to meet the requirement of different frequency of

crystal oscillator:

 eoscr.[6:5]=01 : Low driving capability, for lower frequency, ex: 32KHz crystal oscillator

 eoscr.[6:5]=10 : Middle driving capability, for middle frequency, ex: 1MHz crystal oscillator

 eoscr.[6:5]=11 : High driving capability, for higher frequency, ex: 4MHz crystal oscillator

Table 5 shows the recommended values of C1 and C2 for different crystal oscillator; the measured

start-up time under its corresponding conditions is also shown. Since the crystal or resonator had its

own characteristic, the capacitors and start-up time may be slightly different for different type of crystal

or resonator, please refer to its specification for proper values of C1 and C2.

Frequency

Measured

Start-up time

Conditions

4MHz

4.7pF

6ms

(eoscr[6:5]=11, misc.6=0)

1MHz

10pF

11ms

(eoscr[6:5]=10, misc.6=0)

32KHz

22pF

450ms

(eoscr[6:5]=01, misc.6=0)

Table 5 Recommend values of C1 and C2 for crystal and resonator oscillators

PA7/X1

PA6/X2

The values of C1 and C2 should depend on

the specification of crystal.

eoscr.7

(Enable crystal oscillator)

eoscr[6:5]

(Select driving current for oscillator)

System clock = EOSC

PA7/X1

PA6/X2

The values of C1 and C2 should depend on

the specification of crystal.

eoscr.7

(Enable crystal oscillator)

eoscr[6:5]

(Select driving current for oscillator)

System clock = EOSC

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