DS1065
1
(MSB)
X
X
INTERNAL OSCILLATOR DIVIDED BY 1
(LSB)
N (9-BITS)
DIV WORD
Figure 3
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
000000000
000000001
.
.
.
.
.
111111111
DIVISOR (N)
VALUE
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
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