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CPU

User Manual

UM001604-0108 Instruction Set

149

Additional symbols used are listed in Table 38.

Assignment of a value is indicated by the symbol “

←”. For example,

dst ← dst + src

indicates the source data is added to the destination data and the result is stored in the des-

tination location.

The notation 'addr(n)' is used to refer to bit'n' of a given location. For example,

dst (7)

refers to bit 7 of the destination operand.

Assembly Language Syntax

For proper instruction execution, Z8 assembly language syntax requires ‘dst, src’ be spec-

ified, in that order. The following instruction descriptions show the format of the object

code produced by the assembler. This binary format should be followed if manual pro-

gram coding is preferred or if you intend to implement your own assembler.

Example: If the contents of registers

43h and 08h are added and the result is stored in

43h, the assembly syntax and resulting object code is:

Table 38. Additional Symbols

Symbol Definition

dst Destination Operand

src Source Operand

@ Indirect Address Prefix

SP Stack Pointer

PC Program Counter

FLAGS Flag Register (FCh)

RP Register Pointer (FDh)

IMR Interrupt Mask Register (FBh)

# Immediate Operand Prefix

% Hexadecimal Number Prefix

H Hexadecimal Number Suffix

B Binary Number Suffix

OPC Opcode

ZiLOG Z8 Series User Manual

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