Chapter 20
Appendix
XX - 2 Symbol Definitions
20.1 Symbol Definitions
Following is the list of symbols used in the instruction specifications.
Nibble is a unit for expressing size, and a nibble is equivalent to half-byte (4 bits).
Reg, Reg1, Reg2 : register ( used for general meaning )
Dn, Dm : Data register ( 8 bits )
DWn, DWm, DWk : Data register ( 16 bits )
DWn-l : Lower 8 bits of 16-bit data register
DWn-h : Higher 8 bits of 16-bit data register
An, Am : Address register ( 16 bits )
PSW : Processor Status Word ( 8 bits )
PC : Program Counter ( 21 bits )
SP : Stack Pointer ( 16 bits )
HA : Handy Address ( 16 bits )
HA-l : Lower 8 bits of Handy Address
HA-h : Higher 8 bits of Handy Address
abs : Absolute address ( used for general meaning )
abs8 : Absolute address ( 8 bits )
abs12 : Absolute address ( 12 bits )
abs16 : Absolute address ( 16 bits )
abs18 : Absolute address ( 18 bits )
abs20 : Absolute address ( 20 bits )
( ) : Memory space specified by the contents of the parentheses.
imm : immediate value ( used for general meaning )
imm3 : Immediate value ( 3 bits )
imm4 : Immediate value (4 bits )
imm8 : Immediate value ( 8 bits )
imm16 : Immediate value ( 16 bits )
tbl4 : Table address ( 4 bits )
d4 : Displacement ( 4 bits )
d7 : Displacement ( 7 bits )
d8 : Displacement (8 bits )
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