Z8 Encore! XP® F08xA Series
Product Specification
13
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.
®
Table 5. Z8 Encore! XP F08xA Series Program Memory Maps
Program Memory Address (Hex)
Function
Z8F082A and Z8F081A Products
0000–0001
Flash Option Bits
Reset Vector
0002–0003
0004–0005
WDT Interrupt Vector
Illegal Instruction Trap
Interrupt Vectors*
Program Memory
0006–0007
0008–0037
003E–1FFF
* See Table 31 on page 47 for a list of the interrupt vectors.
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 FE00Hto 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.
PS024705-0405
P R E L I M I N A R Y
Address Space
ZILOG [ ZILOG, INC. ]
