ZUSBOPTSC01ZAC datasheet(47/402 Pages) ZILOG

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PS024604-1005

P R E L I M I N A R Y

Power-On Reset

Z8FMC16100 Series Flash MCU

Product Specification

Power-On Reset

Each device in the Z8FMC16100 Series Flash MCU contains an internal Power-On Reset

(POR) circuit. The POR circuit monitors the supply voltage and holds the device in the

Reset state until the supply voltage reaches a safe operating level. After the supply voltage

exceeds the POR voltage threshold (VPOR) and has stabilized, the POR Counter is enabled

and counts 50 cycles of the Internal Precision Oscillator. At this point the System Clock is

enabled and the POR Counter counts a total of 16 system clock pulses. The device is held

in the Reset state until this second POR Counter sequence has timed out. After the

Z8FMC16100 Series Flash MCU exits the Power-On Reset state, the eZ8 CPU fetches the

Reset vector. Following Power-On Reset, the POR status bit in the Reset Status and Con-

trol Register is set to 1.

Figure 3 illustrates Power-On Reset operation. Refer to the On-Chip Peripheral AC and

DC Electrical Characteristics section on page 265 for the POR threshold voltage

(VPOR).

Voltage Brown-Out Reset

The Z8FMC16100 Series Flash MCU provides low Voltage Brown-Out (VBO) protection.

The VBO circuit senses when the supply voltage drops to an unsafe level (below the VBO

Figure 3. Power-On Reset Operation

Option Bit

Counter Delay

Oscillator

Startup

System Clock

Counter Delay

Internal RESET

Signal

Internal Precision

Oscillator

System Clock

VCC = 0.0V

VCC = 3.3V

VVBO

VPOR

Program Execution

ZUSBOPTSC01ZAC 数据表(PDF) 47 Page - Zilog, Inc.

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