Extension Instruction Specifications
3-3
3.2 Extension Instructions
3.2.1 Explanation of Notations
The notations used to describe instruction manual are shown below.
OP: Opcode
Am, An: Address Register (m, n = 3 to 0)
Dm, Dn: Data Register (m, n = 3 to 0)
SP: Stack Pointer
imm: Immediate value (used as the general meaning)
imm8: 8-bit immediate value
imm16: 16-bit immediate value
imm32: 32-bit immediate value
d8: 8-bit displacement
d16: 16-bit displacement
d32: 32-bit displacement
abs16: 16-bit absolute
abs32: 32-bit absolute
MDR: Multiply/Divide Register (core built in)
MDRQ: High-speed multiplication register (inside Extension Function Unit)
LIR: Loop Instruction Register
LAR: Loop Address Register
PSW: Processor Status Word
PC: Program Counter
( ): Indirect addressing
See "2.4.1 Addressing Modes" for a detailed description.
regs: Multiple register operand
0x....: Hexadecimal notation (The numbers following 0x are expressed in hexadecimal notation.)
Notations used to express flag changes are listed below.
("Flag" is the general term used to refer to the lower 4 bits (V, C, N, Z) in the PSW.)
–: No flag change
+: Flag change
*: Undefined
0: Reset
1: Set