ZUSBOPTSC01ZAC datasheet(246/402 Pages) ZILOG

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Option Bits

P R E L I M I N A R Y

PS024604-1005

Z8 Encore!® Motor Control Flash MCUs

Product Specification

224

It is possible to alter the working values of these bits by accessing the Trim Bit Address

and Data registers, but these working values are lost after a Reset.

There are 32 trim addresses. To read or write these values, the user code must first write a

value between 00h and 1Fh into the Trim Bit Address Register. Writing the Trim Bit Data

User Option Bit Configuration By Reset

Each time the user option bits are programmed or erased, the device must be Reset for the

change to take place.

Option Bit Address Space

The first two bytes of program memory at addresses 0000h, shown in Table 122, and

0001h

, shown in Table 123, are reserved for the user option bits.

Program Memory Address 0000H

Table 122. User Option Bits at Program Memory Address 0000H

BITS

FIELD WDT_RES WDT_AO

OSC_SEL[1:0]

VBO_AO

Reserved

FWP

RESET

R/W

ADDR

Program Memory 0000H

Note: U = Unchanged by Reset. R/W = Read/Write.

Bit

Position

Value

(H)

Description

[7]

WDT_RES

Watch-Dog Timer Reset

Watch-Dog Timer time-out generates an interrupt request. Interrupts must be

globally enabled for the eZ8 CPU to acknowledge the interrupt request.

Watch-Dog Timer time-out causes a Reset.

[6]

WDT_AO

Watch-Dog Timer Always On

Watch-Dog Timer is automatically enabled.

Watch-Dog Timer is enabled upon execution of the WDT instruction.

Caution:

ZUSBOPTSC01ZAC 数据表(PDF) 246 Page - Zilog, Inc.

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