COP8SE datasheet(14/47 Pages) NSC

Part #	COP8SE

Description	8-Bit CMOS ROM Based and OTP Microcontrollers with 4k Memory and 128 Bytes EERAM

PDF	47 Pages

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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14 / 47 page

5.0 Functional Description (Continued)

5.9.1 Crystal Oscillator

CKI and CKO can be connected to make a closed loop crys-

tal (or resonator) controlled oscillator.

Table 1 shows the component values required for various

standard crystal values.

TABLE 1. Crystal Oscillator Configuration,

A = 25˚C, VCC =5V

R1 (k

Ω)R2 (MΩ)

C1 (pF)

C2 (pF)

CKI Freq.

(MHz)

5.6

100

100–156

0.455

5.9.2 R/C Oscillator

By selecting CKI as a single pin oscillator input, a single pin

R/C oscillator circuit can be connected to it. CKO is available

as a general purpose input, and /or HALT restart input.

Table 2 shows the variation in the oscillator frequency as a

function of the component (R and C) value.

TABLE 2. R/C Oscillator Configuration,

A = 25˚C, VCC =5V

R(k

Ω)

C (pF)

CKI Freq.(MHz)

Instr. Cycle (µs)

3.3

2.2 to 2.7

3.7 to 4.6

5.6

100

1.1 to 1.3

7.4 to 9.0

6.8

100

0.9 to 1.1

8.8 to 10.8

DS100973-50

DS100973-51

FIGURE 10. Crystal and R/C Oscillator

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