Atmel AT90S8515-4 User Manual
7
AT90S8515
0841GS–09/01
Instruction Set Summary
Mnemonic
Operands
Description
Operation
Flags
# Clocks
ARITHMETIC AND LOGIC INSTRUCTIONS
ADD
ADD
Rd, Rr
Add Two Registers
Rd
← Rd + Rr
Z,C,N,V,H
1
ADC
Rd, Rr
Add with Carry Two Registers
Rd
← Rd + Rr + C
Z,C,N,V,H
1
ADIW
Rdl, K
Add Immediate to Word
Rdh:Rdl
← Rdh:Rdl + K
Z,C,N,V,S
2
SUB
Rd, Rr
Subtract Two Registers
Rd
← Rd - Rr
Z,C,N,V,H
1
SUBI
Rd, K
Subtract Constant from Register
Rd
← Rd - K
Z,C,N,V,H
1
SBC
Rd, Rr
Subtract with Carry Two Registers
Rd
← Rd - Rr - C
Z,C,N,V,H
1
SBCI
Rd, K
Subtract with Carry Constant from Reg.
Rd
← Rd - K - C
Z,C,N,V,H
1
SBIW
Rdl, K
Subtract Immediate from Word
Rdh:Rdl
← Rdh:Rdl - K
Z,C,N,V,S
2
AND
Rd, Rr
Logical AND Registers
Rd
←=Rd • Rr
Z,N,V
1
ANDI
Rd, K
Logical AND Register and Constant
Rd
← Rd •=K
Z,N,V
1
OR
Rd, Rr
Logical OR Registers
Rd
← Rd v Rr
Z,N,V
1
ORI
Rd, K
Logical OR Register and Constant
Rd
←=Rd v K
Z,N,V
1
EOR
Rd, Rr
Exclusive OR Registers
Rd
← Rd ⊕ Rr
Z,N,V
1
COM
Rd
One’s Complement
Rd
← $FF - Rd
Z,C,N,V
1
NEG
Rd
Two’s Complement
Rd
← $00 - Rd
Z,C,N,V,H
1
SBR
Rd, K
Set Bit(s) in Register
Rd
← Rd v K
Z,N,V
1
CBR
Rd, K
Clear Bit(s) in Register
Rd
← Rd • ($FF - K)
Z,N,V
1
INC
Rd
Increment
Rd
← Rd + 1
Z,N,V
1
DEC
Rd
Decrement
Rd
← Rd - 1
Z,N,V
1
TST
Rd
Test for Zero or Minus
Rd
← Rd • Rd
Z,N,V
1
CLR
Rd
Clear Register
Rd
← Rd ⊕ Rd
Z,N,V
1
SER
Rd
Set Register
Rd
← $FF
None
1
BRANCH INSTRUCTIONS
RJMP
RJMP
k
Relative Jump
PC
=← PC + k + 1
None
2
IJMP
Indirect Jump to (Z)
PC
← Z
None
2
RCALL
k
Relative Subroutine Call
PC
← PC + k + 1
None
3
ICALL
Indirect Call to (Z)
PC
← Z
None
3
RET
Subroutine Return
PC
← STACK
None
4
RETI
Interrupt Return
PC
← STACK
I
4
CPSE
Rd, Rr
Compare, Skip if Equal
if (Rd = Rr) PC
=← PC + 2 or 3
None
1/2/3
CP
Rd, Rr
Compare
Rd - Rr
Z,N,V,C,H
1
CPC
Rd, Rr
Compare with Carry
Rd - Rr - C
Z,N,V,C,H
1
CPI
Rd, K
Compare Register with Immediate
Rd - K
Z,N,V,C,H
1
SBRC
Rr, b
Skip if Bit in Register Cleared
if (Rr(b) = 0) PC
← PC + 2 or 3
None
1/2/3
SBRS
Rr, b
Skip if Bit in Register is Set
if (Rr(b) = 1) PC
← PC + 2 or 3
None
1/2/3
SBIC
P, b
Skip if Bit in I/O Register Cleared
if (P(b) = 0) PC
← PC + 2 or 3
None
1/2/3
SBIS
P, b
Skip if Bit in I/O Register is Set
if (P(b) = 1) PC
← PC + 2 or 3
None
1/2/3
BRBS
s, k
Branch if Status Flag Set
if (SREG(s) = 1) then PC
←=PC + k + 1
None
1/2
BRBC
s, k
Branch if Status Flag Cleared
if (SREG(s) = 0) then PC
←=PC + k + 1
None
1/2
BREQ
k
Branch if Equal
if (Z = 1) then PC
← PC + k + 1
None
1/2
BRNE
k
Branch if Not Equal
if (Z = 0) then PC
← PC + k + 1
None
1/2
BRCS
k
Branch if Carry Set
if (C = 1) then PC
← PC + k + 1
None
1/2
BRCC
k
Branch if Carry Cleared
if (C = 0) then PC
← PC + k + 1
None
1/2
BRSH
k
Branch if Same or Higher
if (C = 0) then PC
← PC + k + 1
None
1/2
BRLO
k
Branch if Lower
if (C = 1) then PC
← PC + k + 1
None
1/2
BRMI
k
Branch if Minus
if (N = 1) then PC
← PC + k + 1
None
1/2
BRPL
k
Branch if Plus
if (N = 0) then PC
← PC + k + 1
None
1/2
BRGE
k
Branch if Greater or Equal, Signed
if (N
⊕ V = 0) then PC ← PC + k + 1
None
1/2
BRLT
k
Branch if Less Than Zero, Signed
if (N
⊕ V = 1) then PC ← PC + k + 1
None
1/2
BRHS
k
Branch if Half-carry Flag Set
if (H = 1) then PC
← PC + k + 1
None
1/2
BRHC
k
Branch if Half-carry Flag Cleared
if (H = 0) then PC
← PC + k + 1
None
1/2
BRTS
k
Branch if T-flag Set
if (T = 1) then PC
← PC + k + 1
None
1/2
BRTC
k
Branch if T-flag Cleared
if (T = 0) then PC
← PC + k + 1
None
1/2
BRVS
k
Branch if Overflow Flag is Set
if (V = 1) then PC
← PC + k + 1
None
1/2
BRVC
k
Branch if Overflow Flag is Cleared
if (V = 0) then PC
← PC + k + 1
None
1/2
BRIE
k
Branch if Interrupt Enabled
if (I = 1) then PC
← PC + k + 1
None
1/2
BRID
k
Branch if Interrupt Disabled
if (I = 0) then PC
← PC + k + 1
None
1/2