ZUSBOPTSC01ZACG datasheet(170/282 Pages) ZILOG

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PS022827-1212

P R E L I M I N A R Y

Flash Control Register Definitions

Z8 Encore! XP® F082A Series

Product Specification

153

Flash Controller Behavior in DEBUG Mode

The following changes in behavior of the Flash Controller occur when the Flash Control-

ler is accessed using the On-Chip Debugger:

•

The Flash Write Protect option bit is ignored.

•

The Flash Sector Protect Register is ignored for programming and erase

operations.

•

Programming operations are not limited to the page selected in the Page Select

•

Bits in the Flash Sector Protect Register can be written to one or zero.

•

The second write of the Page Select Register to unlock the Flash Controller is not

necessary.

•

The Page Select Register can be written when the Flash Controller is unlocked.

•

The Mass Erase command is enabled through the Flash Control Register.

For security reasons, the Flash controller allows only a single page to be opened for write/

erase. When writing multiple Flash pages, the flash controller must go through the unlock

sequence again to select another page.

Flash Control Register Definitions

This section defines the features of the following Flash Control registers.

Flash Control Register: see page 153

Flash Status Register: see page 155

Flash Page Select Register: see page 156

Flash Sector Protect Register: see page 157

Flash Frequency High and Low Byte Registers: see page 157

Flash Control Register

The Flash Controller must be unlocked using the Flash Control (FCTL) Register before

programming or erasing the Flash memory. Writing the sequence 73H 8CH, sequentially,

to the Flash Control Register unlocks the Flash Controller. When the Flash Controller is

unlocked, the Flash memory can be enabled for Mass Erase or Page Erase by writing the

appropriate enable command to the FCTL. Page Erase applies only to the active page

selected in Flash Page Select Register. Mass Erase is enabled only through the On-Chip

Caution:

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