Z8F082ASH020SC datasheet(31/244 Pages) ZILOG

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PS024705-0405

P R E L I M I N A R Y

Address Space

Z8 Encore! XP® F08xA Series

Product Specification

Program Memory

The eZ8 CPU supports 64KB of Program Memory address space. The Z8 Encore! XP®

F08xA Series devices contain 8KB of on-chip Flash memory in the Program Memory

address space, depending on the device. Reading from Program Memory addresses out-

side the available Flash memory addresses returns FFH. Writing to these unimplemented

Program Memory addresses produces no effect. Table 5 describes the Program Memory

Maps for the Z8 Encore! XP® F08xA Series products.

Data Memory

The Z8 Encore! XP® F08xA Series does not use the eZ8 CPU’s 64KB Data Memory

address space.

Flash Information Area

Table 6 describes the Z8 Encore! XP® F08xA Series Flash Information Area. This 128B

Information Area is accessed by setting bit 7 of the Flash Page Select Register to 1. When

access is enabled, the Flash Information Area is mapped into the Program Memory and

overlays the 128 bytes at addresses FE00H to FF7FH. When the Information Area access is

enabled, all reads from these Program Memory addresses return the Information Area data

rather than the Program Memory data. Access to the Flash Information Area is read-only.

Table 5. Z8 Encore! XP® F08xA Series Program Memory Maps

Program Memory Address (Hex)

Function

Z8F082A and Z8F081A Products

0000–0001

Flash Option Bits

0002–0003

Reset Vector

0004–0005

WDT Interrupt Vector

0006–0007

Illegal Instruction Trap

0008–0037

Interrupt Vectors*

003E–1FFF

Program Memory

* See Table 31 on page 47 for a list of the interrupt vectors.

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