RL78/D1A User's Manual: Hardware - Renesas

Under development
Preliminary document
Specifications in this document are tentative and subject to change.
RL78/D1A CHAPTER 31 INSTRUCTION SET
31.1.3 Description of flag operation column
The change of the flag value when the instruction is executed is shown in the “Flag” column using the following symbols.
(Blank)
0
1
R
Table 31-3. Symbols in “Flag” Column
Symbol Change of Flag Value
Unchanged
Cleared to 0
Set to 1
Set/cleared according to the result
Previously saved value is restored
31.1.4 PREFIX instruction
Instructions with “ES:” have a PREFIX operation code as a prefix to extend the accessible data area to the 1 MB space
(00000H to FFFFFH), by adding the ES register value to the 64 KB space from F0000H to FFFFFH. When a PREFIX
operation code is attached as a prefix to the target instruction, only one instruction immediately after the PREFIX operation
code is executed as the addresses with the ES register value added.
A interrupt and DMA transfer are not acknowledged between a PREFIX instruction code and the instruction
immediately after.
Table 31-4. Use Example of PREFIX Operation Code
Instruction
Opcode
1 2 3 4 5
MOV !addr16, #byte CFH !addr16 #byte
MOV ES:!addr16, #byte 11H CFH !addr16 #byte
MOV A, [HL] 8BH
MOV A, ES:[HL] 11H 8BH
Caution Set the ES register value with MOV ES, A, etc., before executing the PREFIX instruction.
R01UH0317EJ0004 Rev. 0.04 1192
Feb. 22, 2013