Z8F082ASH020SC datasheet(152/244 Pages) ZILOG

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PS024705-0405

P R E L I M I N A R Y

Flash Memory

Z8 Encore! XP® F08xA Series

Product Specification

134

Flash Control Register Definitions

Flash Control Register

The Flash Controller must be unlocked using the Flash Control register before program-

ming 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

Debugger. Writing an invalid value or an invalid sequence returns the Flash Controller to

its locked state. The Write-only Flash Control Register shares its Register File address

with the read-only Flash Status Register

FCMD—Flash Command

73H = First unlock command.

8CH = Second unlock command.

95H = Page Erase command (must be third command in sequence to initiate Page Erase).

63H = Mass Erase command (must be third command in sequence to initiate Mass Erase).

5EH = Enable Flash Sector Protect Register Access

Flash Status Register

The Flash Status register indicates the current state of the Flash Controller. This register

can be read at any time. The read-only Flash Status Register shares its Register File

address with the Write-only Flash Control Register.

Table 79. Flash Control Register (FCTL)

BITS

FIELD

FCMD

RESET

000

R/W

WWW

ADDR

FF8H

Table 80. Flash Status Register (FSTAT)

BITS

FIELD

Reserved

FSTAT

RESET

000

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