Z8F082ASH020SC datasheet(153/244 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

135

Reserved—Must be 0.

FSTAT—Flash Controller Status

000000 = Flash Controller locked.

000001 = First unlock command received (73H written).

000010 = Second unlock command received (8CH written).

000011 = Flash Controller unlocked.

000100 = Sector protect register selected.

001xxx = Program operation in progress.

010xxx = Page erase operation in progress.

100xxx = Mass erase operation in progress

Flash Page Select Register

The Flash Page Select register shares address space with the Flash Sector Protect Register.

Unless the Flash controller is unlocked and written with 5EH, writes to this address target

the Flash Page Select Register.

The register is used to select one of the 8 available Flash memory pages to be programmed

or erased. Each Flash Page contains 512 bytes of Flash memory. During a Page Erase

operation, all Flash memory having addresses with the most significant 7-bits given by

FPS[6:0] are chosen for program/erase operation.

INFO_EN—Information Area Enable

0 = Information Area us not selected

1 = Information Area is selected. The Information Area is mapped into the Program Mem-

ory address space at addresses FE00H through FFFFH.

PAGE—Page Select

This 7-bit field identifies the Flash memory page for Page Erase and page unlocking.

R/W

RRR

ADDR

FF8H

Table 81. Flash Page Select Register (FPS)

BITS

FIELD

INFO_EN

PAGE

RESET

000

R/W

R/WR/W

ADDR

FF9H

Table 80. Flash Status Register (FSTAT)

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