Z8F021ASH020SC datasheet(34/276 Pages) ZILOG

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PS022815-0206

Address Space

Z8 Encore! XP® 4K Series

Product Specification

Data Memory

The Z8 Encore! XP® 4K Series does not use the eZ8 CPU’s 64KB Data Memory address

space.

Flash Information Area

Table 7 describes the Z8 Encore! XP® 4K 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.

0006–0007

Illegal Instruction Trap

0008–0037

Interrupt Vectors*

0038-0039

Reserved

003A-003D

Oscillator Fail Trap Vectors

003E–03FF

Program Memory

Table 7. Z8 Encore! XP®4K Series Flash Memory Information Area Map

Program Memory Address (Hex) Function

FE00–FE3F

ZiLOG Option Bits/Calibration Data

FE40–FE53

Part Number

20-character ASCII alphanumeric code

Left justified and filled with FFH

FE54–FE5F

Reserved

FE60–FE7F

ZiLOG Calibration Data

FE80–FFFF

Reserved

Table 6. Z8 Encore! XP®4K Series Series Program Memory Maps (Continued)

Program Memory Address (Hex)

Function

* See

Table 33 on page 51 for a list of the interrupt vectors.

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