UPD784938 Datasheet, PDF (694/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 29 INSTRUCTION OPERATIONS
(11) Increment/decrement instructions: INC, DEC, INCW, DECW, INCG, DECG
Mnemonic
Operands
Bytes
Operation
INC
DEC
INCW
DECW
INCG
DECG
r
saddr
r
saddr
rp
saddrp
rp
saddrp
rg
rg
1/2
r←r+1
2/3
(saddr) ← (saddr) + 1
1/2
r ← r –1
2/3
(saddr) ← (saddr) – 1
2/1
rp ← rp + 1
3/4
(saddrp) ← (saddrp) + 1
2/1
rp ← rp – 1
3/4
(saddrp) ← (saddrp) – 1
2
rg ← rg + 1
2
rg ← rg – 1
(12) Adjustment instructions: ADJBA, ADJBS, CVTBW
Mnemonic
Operands
Bytes
Operation
ADJBA
ADJBS
CVTBW
2
Decimal Adjust Accumulator after Addition
2
Decimal Adjust Accumulator after Subtract
1
X ← A, A ← 00H if A7 = 0
X ← A, A ← FFH if A7 = 1
Flags
S Z AC P/V CY
×××V
×××V
×××V
×××V
Flags
S Z AC P/V CY
×××P×
×××P×
694
Preliminary User’s Manual U13987EJ1V0UM00