
113
MB90570 Series
Table 2
Explanation of Symbols in Tables of Instructions
Symbol
Meaning
A
32-bit accumulator
The bit length varies according to the instruction.
Byte : Lower 8 bits of AL
Word : 16 bits of AL
Long : 32 bits of AL and AH
AH
AL
Upper 16 bits of A
Lower 16 bits of A
SP
Stack pointer (USP or SSP)
PC
Program counter
PCB
Program bank register
DTB
Data bank register
ADB
Additional data bank register
SSB
System stack bank register
USB
User stack bank register
SPB
Current stack bank register (SSB or USB)
DPR
Direct page register
brg1
DTB, ADB, SSB, USB, DPR, PCB, SPB
brg2
DTB, ADB, SSB, USB, DPR, SPB
Ri
R0, R1, R2, R3, R4, R5, R6, R7
RWi
RW0, RW1, RW2, RW3, RW4, RW5, RW6, RW7
RWj
RW0, RW1, RW2, RW3
RLi
RL0, RL1, RL2, RL3
dir
Compact direct addressing
addr16
addr24
ad24 0 to 15
ad24 16 to 23
Direct addressing
Physical direct addressing
Bit 0 to bit 15 of addr24
Bit 16 to bit 23 of addr24
io
I/O area (000000H to 0000FFH)
imm4
imm8
imm16
imm32
ext (imm8)
4-bit immediate data
8-bit immediate data
16-bit immediate data
32-bit immediate data
16-bit data signed and extended from 8-bit immediate data
disp8
disp16
8-bit displacement
16-bit displacement
bp
Bit offset
vct4
vct8
Vector number (0 to 15)
Vector number (0 to 255)
( )b
Bit address
rel
PC relative addressing
ear
eam
Effective addressing (codes 00 to 07)
Effective addressing (codes 08 to 1F)
rlst
Register list