COP682C datasheet(12/30 Pages) NSC

12 / 30 page

Functional Description (Continued)

TLDD10802 – 6

RC t 5X Power Supply Rise Time

FIGURE 4 Recommended Reset Circuit

OSCILLATOR CIRCUITS

Figure 5 shows the three clock oscillator configurations

A CRYSTAL OSCILLATOR

The device can be driven by a crystal clock The crystal

network is connected between the pins CKI and CKO

Table I shows the component values required for various

standard crystal values

B EXTERNAL OSCILLATOR

CKI can be driven by an external clock signal CKO is avail-

able as a general purpose input andor HALT restart con-

trol

C RC OSCILLATOR

CKI is configured as a single pin RC controlled Schmitt trig-

ger oscillator CKO is available as a general purpose input

andor HALT restart control

Table II shows the variation in the oscillator frequencies as

functions of the component (R and C) values

TLDD10802 – 7

FIGURE 5 Crystal and R-C Connection Diagrams

OSCILLATOR MASK OPTIONS

The device can be driven by clock inputs between DC and

10 MHz

TABLE I Crystal Oscillator Configuration TA e 25 C

CKI Freq

Conditions

(kX)(MX)

(pF)

(MHz)

30 – 36

VCC e 5V

30 – 36

VCC e 25V

200

100 – 150

0455

VCC e 5V

TABLE II RC Oscillator Configuration TA e 25 C

CKI Freq

Instr Cycle

Conditions

(kX)

(pF)

(MHz)

(ms)

22 to 27

37 to 46

VCC e 5V

100

11 to 13

74 to 90

VCC e 5V

100

09 to 11

88 to 108

VCC e 5V

Note

(RC Oscillator Configuration) 3k s R s 200k 50 pF s C s 200 pF

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