DS1065

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1

X

X

INTERNAL OSCILLATOR DIVIDED BY 1

DIV WORD Figure 3

(MSB)

(LSB)

N (9-BITS)

N

These 9 bits determine the value of the programmable divider. The range of divisor values is from 2 to

513, and is equal to the programmed value of N plus 2:

Table 3

BIT

VALUES

DIVISOR (N)

VALUE

000000000

000000001

.

.

.

.

.

111111111

2

3

.

.

.

.

.

513

POWER-ON RESET

When power is initially applied to the device supply pin, a power-on reset sequence is executed, similar

to that which occurs when the device is restored from a power-down condition. This sequence comprises

two stages, first a conventional POR to initialize all on-chip circuitry, followed by a stabilization period

to allow the oscillator to reach a stable frequency before enabling the output:

1. Initialize internal circuitry.

2. Enable internal oscillator.

3. Set M and N to maximum values.

4. Wait approximately 1024 cycles of INTOSC for the oscillator to stabilize.

5. Load M and N programmed values from EEPROM.

6. Enable OUT.

Figure 10