Introduction; Z8 Mcu Standard Register File - ZiLOG Z8 User Manual

2.1 INTRODUCTION

Four address spaces are available for the Z8 MCU
• 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 registers for additional peripherals/features.

2.2 Z8 MCU 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 reg-
isters (F0H-FFH). Table 2-1 shows the layout of the register file,
including register names, locations, and identifiers.
Table 2-1. Z8 Standard Register File
Hex Register
Address Description
FF Stack Pointer Low Byte
FE Stack Pointer High Byte
FD Register Pointer
FC Program Control Flags
FB Interrupt Mask Register
FA Interrupt Request Register
F9 Interrupt Priority Register
F8 Port 0-1 Mode Register
F7 Port 3 Mode Register
F6 Port 2 Mode Register
F5 T0 Prescaler
F4 Timer/Counter 0
F3 T1 Prescaler
F2 Timer/Counter 1
F1 Timer Mode
UM001601-0803
C
HAPTER
A S
DDRESS PACE
®
: • 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.
Hex
Address
F0
EF
Register
Identifier
SPL
04
SPH
03
RP
02
FLAGS
01
IMR
00
IRQ
IPR
P01M
P3M
P2M
PRE0
T0
PRE1
T1
TMR
2
Table 2-1. Z8 Standard Register File
Register
Description
Serial I/O
. General-Purpose
. Registers (GPR)
.
Port 3
Port 2
Port 1
Port 0
U ' M
SER S ANUAL
Register
Identifier
SIO
R239
.
.
.
R4
P3
P2
P1
P0
2-1