Z86E3016PSG Datasheet, PDF (25/348 Pages) Zilog, Inc. – Z86E3016PSG

Z8 CPU
User Manual
7
Address Space
Introduction
Four address spaces are available for the Z8^® CPU:
• The Z8^® Standard Register File contains addresses for peripheral,
control, all general-purpose, and all I/O port registers. This is the
default register file specification.
• The Z8^® Expanded Register File (ERF) contains addresses for con-
trol and data registers for additional peripherals/features.
• Z8 external program memory contains addresses for all memory loca-
tions having executable code and/or data.
• Z8 external data memory contains addresses for all memory locations
that hold data only, whether internal or external.
Z8 CPU Standard Register File
The Z8^® Standard Register File totals up to 256 consecutive bytes (Regis-
ters). The register file consists of 4 I/O ports (00h–03h), 236 General-
Purpose Registers (04h–EFh), and 16 control registers (F0h–FFh).
Table 2 shows the layout of the register file, including register names,
locations, and identifiers.
Table 2. Z8 Standard Register File
Hex Address Register Identifier Register Description
FF
SPL
Stack Pointer Low Byte
FE
SPH
Stack Pointer High Byte
FD
RP
Register Pointer
UM001602-0904
Address Space