UPD789014 Datasheet, PDF (51/123 Pages) NEC – 8-Bit Single-Chip Microcontroller Instructions

4.2 Instruction Codes
CHAPTER 4 INSTRUCTION SET
4.2.1 Description of instruction code table
r
R2 R1
R0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
reg
R0 X
R1 A
R2 C
R3 B
R4 E
R5 D
R6 L
R7 H
rp
P1
P0 reg-pair
0
0 RP0 AX
0
1 RP1 BC
1
0 RP2 DE
1
1 RP3 HL
Bn:
Immediate data corresponding to “bit”
Data:
8-bit immediate data corresponding to “byte”
Low/High byte: 16-bit immediate data corresponding to “word”
Saddr-offset: 16-bit address lower 8-bit offset data corresponding to “saddr”
Sfr-offset:
sfr 16-bit address lower 8-bit offset data
Low/High addr: 16-bit immediate data corresponding to “addr16”
jdisp:
Signed two's complement data (8 bits) of relative address distance between the start and branch
addresses of the next instruction
ta4 to 0:
5 bits of immediate data corresponding to “addr5”
User’s Manual U11047EJ3V0UM00
51