Zilog Z86193 - Manual (Page 12)

Z8
®
CPU
User Manual
UM001604-0108 Address Space
5
Address Space
Introduction
Z8
®
CPU includes the following four address spaces:
•
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 control and data regis-
ters for additional peripherals/features.
•
Z8 external Program Memory contains addresses for all memory locations 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 (Registers). 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 lists 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
FC FLAGS Program Control Flags
FB IMR Interrupt Mask Register
FA IRQ Interrupt Request Register
F9 IPR Interrupt Priority Register
F8 P01M Port 0–1 Mode Register
F7 P3M Port 3 Mode Register
F6 P2M Port 2 Mode Register
F5 PRE0 T0 Prescaler