Zilog Z8F0130 - Manual (Page 31)

eZ8
™
CPU Core
User Manual
UM012820-0810 Z8
®
Compatibility
16
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.