Z86L70 Datasheet, PDF (41/61 Pages) Zilog, Inc. – IR/Low-Voltage Microcontroller

Zilog
Z86L70/71/75/C71
IR/Low-Voltage Microcontroller
Power-On Reset (POR). A timer circuit clocked by a ded- 1. Power Fail to Power OK status.
icated on-board RC oscillator is used for the Power-On Re-
set (POR) timer function. The POR time allows V_CC and ^{2. Stop-Mode Recovery (if D5 of SMR = 1).}
the oscillator circuit to stabilize before instruction execu-
1
tion begins.
3. WDT Time-Out.
The POR timer circuit is a one-shot timer triggered by one
of three conditions:
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).
XTAL1
XTAL1
XTAL1
C1
C1
C1
L
R
XTAL2
XTAL2
C2
C2
XTAL2
XTAL1
XTAL2
Ceramic Resonator or Crystal
C1, C2 = 47 pF TYP *
f = 8 MHz
* Preliminary value including pin parasitics
LC
C1, C2 = 22 pF
L = 130 µH *
f = 3 MHz *
RC
@ 3V VCC (TYP)
C1 = 33 pF *
R = 1K *
Figure 31. Oscillator Configuration
External Clock
DS97LVO0500
PRELIMINARY
1-41