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Z86E72 Datasheet(PDF) 48 Page - Zilog, Inc.

No. de Pieza. Z86E72
Descripción  OTP IR MICROCONTROLLERS
Descarga  74 Pages
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Fabricante  ZILOG [Zilog, Inc.]
Página de inicio  http://www.zilog.com
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Z86E72 Datasheet(HTML) 48 Page - Zilog, Inc.

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Z86E72/E73
OTP IR Microcontrollers
1-48
P R E L I M I N A R Y
DS96LVO1100
COUNTER/TIMER REGISTER DESCRIPTION (Continued)
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:
1.
Power Fail to Power OK status.
2.
Stop-Mode Recovery (if D5 of SMR = 1).
3.
WDT Time-Out.
The POR time is a nominal 5 ms. Bit 5 of the Stop-Mode
Register determines whether the POR timer is bypassed
after Stop-Mode Recovery (typical for external clock, RC,
LC oscillators).
Figure 38. Oscillator Configuration
XTAL1
XTAL2
C1
C2
C1
C2
C1
XTAL1
XTAL2
XTAL1
XTAL2
XTAL1
XTAL2
Ceramic Resonator or Crystal
C1, C2 = 47 pF TYP *
f = 8 MHz
LC
C1, C2 = 22 pF
L = 130
µH *
f = 3 MHz *
RC
@ 3V VCC (TYP)
C1 = 33 pF *
R = 1K *
External Clock
L
R
* Preliminary value including pin parasitics
C1
32 kHz XTAL
C1 = 20 pF, C = 33
pF
Rd = 56 - 470K
Rf =10 M
Rf
C2
Rd
XTAL1
XTAL2


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