ZUSBOPTSC01ZAC datasheet(48/402 Pages) ZILOG

48 / 402 page

Reset and Stop-Mode Recovery

P R E L I M I N A R Y

PS024604-1005

Z8 Encore!® Motor Control Flash MCUs

Product Specification

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 holds the device in

the Reset state.

After the supply voltage again exceeds the Power-On Reset voltage threshold and stabi-

lized, the device progresses through a full System Reset sequence, as described in the

Power-On Reset section. Following Power-On Reset, the POR status bit in the Reset

Source register is set to 1. Figure 4 illustrates Voltage Brown-Out operation. Refer to the

On-Chip Peripheral AC and DC Electrical Characteristics section on page 265 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 controlled by the VBO_AO Option Bit. Refer to the Option

Bits chapter for information on configuring VBO_AO.

Watch-Dog Timer Reset

If the device is in normal or HALT mode, the Watch-Dog Timer can initiate a System

Reset at time-out if the WDT_RES Option Bit is set to 1. This setting is the default (unpro-

grammed) setting of the WDT_RES Option Bit. The WDT status bit in the Reset Status and

Control Register is set to signify that the reset was initiated by the Watch-Dog Timer.

Figure 4. Voltage Brown-Out Reset Operation

Option Bit

Counter Delay

System Clock

Counter Delay

Internal RESET

Signal

Internal Precision

Oscillator

System Clock

VCC = 3.3V

VVBO

VPOR

Program Execution

Program

Execution

Voltage

Brown-Out

ZUSBOPTSC01ZAC 数据表(PDF) 48 Page - Zilog, Inc.

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