S3C80M4 Datasheet, PDF (49/248 Pages) Samsung semiconductor – 8-BIT CMOS MICROCONTROLLERS USERS MANUAL

S3C80M4/F80M4
INDIRECT REGISTER ADDRESSING MODE (Continued)
ADDRESSING MODES
MSB Points to
RP0 or RP1
Register File
RP0 or RP1
4-bit
Working
Register
Address
Program Memory
~
~
dst
src
OPCODE
3 LSBs
Point to the
Working Register
(1 of 8)
ADDRESS
~
~
Sample Instruction:
OR
R3, @R6
Value used in
Instruction
OPERAND
Selected
RP points
to start fo
working register
block
Figure 3-5. Indirect Working Register Addressing to Register File
3-5