Z86L71 datasheet(41/61 Pages) ZILOG

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Z86L70/71/75/C71

Zilog

IR/Low-Voltage Microcontroller

DS97LVO0500

P R E L I M I N A R Y

1-41

Power-On Reset (POR). A timer circuit clocked by a ded-

icated on-board RC oscillator is used for the Power-On Re-

set (POR) timer function. The POR time allows VCC and

the oscillator circuit to stabilize before instruction execu-

tion begins.

The POR timer circuit is a one-shot timer triggered by one

of three conditions:

Power Fail to Power OK status.

Stop-Mode Recovery (if D5 of SMR = 1).

WDT Time-Out.

The POR time is a nominal 5 ms. Bit 5 of the Stop-Mode

after Stop-Mode Recovery (typical for external clock, RC,

LC oscillators).

Figure 31. Oscillator Conﬁguration

XTAL1

XTAL2

XTAL1

XTAL2

XTAL1

XTAL2

XTAL1

XTAL2

Ceramic Resonator or Crystal

C1, C2 = 47 pF TYP *

f = 8 MHz

C1, C2 = 22 pF

L = 130

µH *

f = 3 MHz *

@ 3V VCC (TYP)

C1 = 33 pF *

R = 1K *

External Clock

* Preliminary value including pin parasitics

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