ADDRESS SPACES

S3C84E5/C84E9/P84E9

 

 

RP0

RP1

Selects

RP0 or RP1

AddressOPCODE

Register pointer provides five high-order bits

4-bit address provides three low-order bits

Together they create an 8-bit register address

Figure 2-11. 4-Bit Working Register Addressing

RP0

0

1

1

1

0

0

0

0

 

 

 

 

 

 

 

 

RP1

0

1

1

1

1

0

0

0

 

 

 

 

 

 

 

 

Selects RP0

0 1 1 1 0

1 1 0

Register address (76H)

R6 OPCODE

0

1

1

0

1

1

1

0

 

 

 

 

 

 

 

 

Instruction 'INC R6'

Figure 2-12. 4-Bit Working Register Addressing Example

2-16

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Image 51
Samsung S3C84E5 user manual RP0 RP1, R6 Opcode