Z8F021ASH020SC datasheet(171/276 Pages) ZILOG

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PS022815-0206

Flash Option Bits

Z8 Encore! XP® 4K Series

Product Specification

152

OSC_SEL[1:0]—Oscillator Mode Selection

00 = On-chip oscillator configured for use with external RC networks (<4MHz).

01 = Minimum power for use with very low frequency crystals (32KHz to 1.0MHz).

10 = Medium power for use with medium frequency crystals or ceramic resonators

(0.5MHz to 5.0MHz).

11 = Maximum power for use with high frequency crystals (5.0MHz to 20.0MHz). This

setting is the default for unprogrammed (erased) Flash.

VBO_AO—Voltage Brown-Out Protection Always On

0 = Voltage Brown-Out Protection is disabled in STOP mode to reduce total power con-

sumption.

1 = Voltage Brown-Out Protection is always enabled including during STOP mode. This

setting is the default for unprogrammed (erased) Flash.

FRP—Flash Read Protect

0 = User program code is inaccessible. Limited control features are available through the

On-Chip Debugger.

1 = User program code is accessible. All On-Chip Debugger commands are enabled. This

setting is the default for unprogrammed (erased) Flash.

Reserved—Must be 1.

FWP—Flash Write Protect

This Option Bit provides Flash Program Memory protection:

0 = Programming and erasure disabled for all of Flash Program Memory. Programming,

Page Erase, and Mass Erase through User Code is disabled. Mass Erase is available using

the On-Chip Debugger.

1 = Programming, Page Erase, and Mass Erase are enabled for all of Flash program mem-

ory.

Flash Program Memory Address 0001H

Reserved—Must be 1.

XTLDIS—State of Crystal Oscillator at Reset:

Table 90. Flash Options Bits at Program Memory Address 0001H

BITS

FIELD

Reserved

XTLDIS

Reserved

RESET

UUU

R/W

R/WR/W

ADDR

Program Memory 0001H

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

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