Renesas rl78 User Manual

 

RL78/G1A 

 

CHAPTER  3   CPU  ARCHITECTURE 

R01UH0305EJ0200  Rev.2.00 

 

 

84  

Jul 04, 2013 

 

Short direct addressing directly specifies the target addresses using 8-bit data in the instruction word.  This type of 

addressing is applied only to the space from FFE20H to FFF1FH.   

 

 

Identifier Description 

SADDR 

Label, FFE20H to FFF1FH immediate data, or 0FE20H to 0FF1FH immediate data  

(only the space from FFE20H to FFF1FH is specifiable) 

SADDRP 

Label, FFE20H to FFF1FH immediate data, or 0FE20H to 0FF1FH immediate data (even address only) 

(only the space from FFE20H to FFF1FH is specifiable) 

 

 

OP code

Memory

saddr

FFF1FH

FFE20H

saddr

Instruction code

 

 

Remark  SADDR and SADDRP are used to describe the values of addresses FE20H to FF1FH with 16-bit immediate 

data (higher 4 bits of actual address are omitted), and the values of addresses FFE20H to FFF1FH with 20-

bit immediate data. 

Regardless of whether SADDR or SADDRP is used, addresses within the space from FFE20H to FFF1FH 

are specified for the memory.