ZUSBOPTSC01ZACG datasheet(42/282 Pages) ZILOG

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PS022827-1212

P R E L I M I N A R Y

Reset Sources

Z8 Encore! XP® F082A Series

Product Specification

Voltage Brown-Out Reset

The devices in the Z8 Encore! XP F082A Series provide low Voltage Brown-Out (VBO)

protection. The VBO circuit senses when the supply voltage drops to an unsafe level

(below the VBO threshold voltage) and forces the device into the Reset state. While the

supply voltage remains below the Power-On Reset voltage threshold (VPOR), the VBO

block holds the device in the Reset.

After the supply voltage again exceeds the Power-On Reset voltage threshold, the device

progresses through a full System Reset sequence, as described in the Power-On Reset sec-

tion. Following Power-On Reset, the POR status bit in the Reset Status (RSTSTAT) Regis-

ter is set to 1. Figure 6 displays Voltage Brown-Out operation. See the Electrical

Characteristics chapter on page 226 for the VBO and POR threshold voltages (VVBO and

VPOR).

The Voltage Brown-Out circuit can be either enabled or disabled during STOP Mode.

Operation during STOP Mode is set by the VBO_AO Flash option bit. See the Flash

Option Bits chapter on page 159 for information about configuring VBO_AO.

Figure 5. Power-On Reset Operation

VCC = 0.0 V

VCC = 3.3V

VPOR

VVBO

Internal Precision

Internal RESET

signal

Program

Execution

Oscillator

Start-up

POR

counter delay

optional XTAL

counter delay

Oscillator

Crystal

Oscillator

Note: Not to Scale

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