ZiLOG Z8 User Manual

Z8 Microcontrollers
Addressing Modes ZiLOG
11-2 UM001601-0803
11.2 Z8 REGISTER ADDRESSING (R)
In 8-bit Register Addressing mode, the operand value is equiva-
lent to the contents of the specified register or register pair.
In the Register Addressing (Figure 11-1), the destination and/or
source address specified corresponds to the actual register in the
register file.
In 4-bit Register Addressing (Figure 11-2), the destination
and/or source addresses point to the Working Register within the
current Working Register Group. This 4-bit address is combined
with the upper four bits of the Register Pointer to form the actual
8-bit address of the affected register.
Figure 11-1. 8-Bit Register Addressing
OpCode
One Operand
Register File
Operand
Program Memory
Points to
dst
8-Bit Register
One Register
in the
Register
File
Instruction
(Example)
File Address
Figure 11-2. 4-Bit Register Addressing
Op Code
Two Operand
Register File
Operand
Program Memory
Points to
src
4-Bit Working
One Register
in the
Register
File
Instruction
(Example)
Registers
Operand
RP
dst
Points to
Origin of
Working
Register
Group

ZiLOG Z8 Specifications

General

Brand	ZiLOG
Model	Z8
Category	Desktop
Language	English