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Z86L71 Datasheet(PDF) 41 Page - Zilog, Inc. |
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Z86L71 Datasheet(HTML) 41 Page - Zilog, Inc. |
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41 / 61 page  Z86L70/71/75/C71 Zilog IR/Low-Voltage Microcontroller DS97LVO0500 P R E L I M I N A R Y 1-41 1 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 31. 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 |
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