S3C9454B View Datasheet(PDF) - Samsung
Part Name
Description
MFG CO.
'S3C9454B' PDF : 199 Pages View PDF
ADDRESSING MODES
S3C9454B/F9454B
REGISTER ADDRESSING MODE (R)
In Register addressing mode, the operand is the content of a specified register (see Figure 3-1). Working register
addressing differs from Register addressing because it uses an 16-byte working register space in the register file
and an 4-bit register within that space (see Figure 3-2).
8-Bit Register
File Address
One-Operand
Instruction
(Example)
Program Memory
Register File
dst
OPCODE
Point to one
register in register
file
OPERAND
Value used in
Instruction Execution
Sample Instruction:
DEC CNTR
; Where CNTR is the label of an 8-bit register address
Figure 3-1. Register Addressing
MSB point to
RP0 to RP1
Register File
RP0 or RP1
4-Bit
Working Register
Two-Operand
Instruction
(Example)
Program Memory
dst
src
OPCODE
3 LSBs
Point to the
working register
(1 of 8)
OPERAND
Selected
RP points to
start of
working
register block
Sample Instruction:
ADD R1, R2
; Where R1 and R2 are registers in the currently selected
working register area.
Figure 3-2. Working Register Addressing
3-2
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