UPD78F9418A NEC, UPD78F9418A Datasheet - Page 67

• Manufacturer Part Number: UPD78F9418A
• Description: (UPD7894xxA) 8-Bit Single Chip Microcontrollers
• Manufacturer: NEC

www.DataSheet4U.com
3.4.4 Register addressing
[Function]
[Operand format]
[Description example]
In the register addressing mode, general-purpose registers are accessed as operands. The general-purpose
register to be accessed is specified by the register specification code or functional name in the instruction
code.
Register addressing is carried out when an instruction with the following operand format is executed. When
an 8-bit register is specified, one of the eight registers is specified with 3 bits in the instruction code.
r and rp can be described using absolute names (R0 to R7 and RP0 to RP3) as well as functional names (X,
A, C, B, E, D, L, H, AX, BC, DE, and HL).
MOV A, C; When selecting the C register for r
INCW DE; When selecting the DE register pair for rp
Identifier
rp
r
X, A, C, B, E, D, L, H
AX, BC, DE, HL
Instruction code
Instruction code
CHAPTER 3 CPU ARCHITECTURE
0
0
1
User’s Manual U13952EJ3V0UD
0
0
0
Description
0
1
0
0
0
0
1
0
1
0
1
0
1
0
0
0
1
0
Register specification code
Register specification code
67