Indirect Working Register Addressing To Program Or Data Memory - Samsung S3F80JB User Manual

ADDRESSING MODES
INDIRECT REGISTER ADDRESSING MODE (Continued)
4-bit Working
Register Address
Example Instruction
References either
Program Memory or
Data Memory
Sample Instructions:
LCD
LDE
LDE
NOTE:
Figure 3-6. Indirect Working Register Addressing to Program or Data Memory
3-6
Program Memory
dst src
OPCODE
R5,@RR6
R3,@RR14
@RR4, R8
LDE command is not available, because an external interface is not implemented
for the S3F80JB.
Register File
MSB Points to
RP0 or RP1
RP0 or RP1
Next 2-bit Point
to Working
Register Pair
(1 of 4)
Program Memory
LSB Selects
Data Memory
Value used in
OPERAND
Instruction
; Program memory access
; External data memory access
; External data memory access
Selected
RP points
to start of
working
register
block
Register
Pair
16-Bit
address
points to
program
or
memory
or data
memory
S3F80JB