Zilog Z8F0130 Bedienungsanleitung PDF herunterladen (Seite 31)

eZ8

™

CPU Core

User Manual

UM012820-0810 Z8

Compatibility

Stack Pointer Compatibility

The stack pointer is now 12 bits in length and provided by {SPH[3:0],

SPL[7:0]}. This change allows the origin of the stack to be placed at any

address from

000h to EFFh where general-purpose registers are available.

Refer to the Zilog Product Specification specific to your Z8 Encore!

device for available Register File addresses. All stack pointer operations

occur within the Register File address space.

Reset Compatibility

Unlike the Z8 CPU which uses a fixed reset address of 00Ch, the 

eZ8 CPU uses a vectored reset. Program Memory stores the RESET vec-

tor at addresses

0002h and 0003h (most significant byte at 0002h and

least significant byte at

0003h). When the eZ8 CPU is reset it fetches the

RESET vector at addresses

0002h and 0003h. The eZ8 CPU writes the

RESET factor to the Program Counter and executes code at the new Pro-

gram Counter address.

Interrupt Compatibility

The interrupt table now resides at starting address 0008h in Program

Memory to accommodate the increased number of interrupts available

with the eZ8 CPU.

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Zilog Z8F0130 Bedienungsanleitung Seite 31