COP87L88FH datasheet(11/45 Pages) NSC

Part #	COP87L88FH

Description	8-Bit CMOS OTP Microcontrollers with 16k Memory,

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Manufacturer	NSC [National Semiconductor (TI)]

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Reset (Continued)

Oscillator Circuits

The chip can be driven by a clock input on the CKI input pin

which can be between DC and 10 MHz. The CKO output

clock is on pin G7 (crystal configuration). The CKI input fre-

quency is divided down by 10 to produce the instruction

cycle clock (t

c).

Figure 7 shows the Crystal and R/C oscillator diagrams.

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.

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 frequencies as

functions of the component (R and C) values.

EXTERNAL OSCILLATOR

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

able as a general purpose input and/or HALT restart control.

TABLE 1. Crystal Oscillator Configuration, T

A = 25˚C

R1

R2

C1

C2

CKI Freq

Conditions

(k

Ω)(MΩ) (pF)

(pF)

(MHz)

0

1

30

30–36

10

V

CC = 5V

0

1

30

30–36

4

V

CC = 5V

0

1

200 100–150

0.455

V

CC = 5V

TABLE 2. RC Oscillator Configuration, T

A = 25˚C

R

C

CKI Freq

Instr. Cycle

Conditions

(k

Ω)

(pF)

(MHz)

(µs)

3.3

82

2.2 to 2.7

3.7 to 4.6

V

CC = 5V

5.6

100

1.1 to 1.3

7.4 to 9.0

V

CC = 5V

6.8

100

0.9 to 1.1

8.8 to 10.8

V

CC = 5V

Note: 3k

≤ R ≤ 200k

50 pF

≤ C ≤ 200 pF

DS101135-8

RC > 5 x Power Supply Rise Time

FIGURE 6. Recommended Reset Circuit

Crystal Oscillator

DS101135-9

External Oscillator

DS101135-10

R/C Oscillator

DS101135-11

FIGURE 7. Crystal R/C, and

External Oscillator Diagrams

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COP87L88FH Datasheet(PDF) 11 Page - National Semiconductor (TI)

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