AT90S1200
Instruction Set Summary
Mnemonic
Operands
Description
Operation
Flags
# Clocks
ARITHMETIC AND LOGIC INSTRUCTIONS
ADD
ADC
SUB
SUBI
SBC
SBCI
AND
ANDI
OR
Rd, Rr
Rd, Rr
Rd, Rr
Rd, K
Rd, Rr
Rd, K
Rd, Rr
Rd, K
Rd, Rr
Rd, K
Rd, Rr
Rd
Add Two Registers
Rd ← Rd + Rr
Rd ← Rd + Rr + C
Rd ← Rd - Rr
Rd ← Rd - K
Rd ← Rd - Rr - C
Rd ← Rd - K - C
Rd ← Rd • Rr
Rd ← Rd • K
Rd ← Rd v Rr
Rd ← Rd v K
Rd ← Rd ⊕ Rr
Rd ← $FF - Rd
Rd ← $00 - Rd
Rd ← Rd v K
Rd ← Rd • (FFh - K)
Rd ← Rd + 1
Rd ← Rd - 1
Rd ← Rd • Rd
Rd ← Rd ⊕ Rd
Rd ← $FF
Z,C,N,V,H
Z,C,N,V,H
Z,C,N,V,H
Z,C,N,V,H
Z,C,N,V,H
Z,C,N,V,H
Z,N,V
Z,N,V
Z,N,V
Z,N,V
Z,N,V
Z,C,N,V
Z,C,N,V,H
Z,N,V
Z,N,V
Z,N,V
Z,N,V
Z,N,V
Z,N,V
None
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Add with Carry Two Registers
Subtract Two Registers
Subtract Constant from Register
Subtract with Carry Two Registers
Subtract with Carry Constant from Reg.
Logical AND Registers
Logical AND Register and Constant
Logical OR Registers
Logical OR Register and Constant
Exclusive OR Registers
One’s Complement
Two’s Complement
Set Bit(s) in Register
Clear Bit(s) in Register
Increment
Decrement
ORI
EOR
COM
NEG
SBR
CBR
INC
DEC
TST
CLR
SER
Rd
Rd, K
Rd, K
Rd
Rd
Rd
Test for Zero or Minus
Clear Register
Set Register
Rd
Rd
BRANCH INSTRUCTIONS
RJMP
RCALL
RET
k
k
Relative Jump
Relative Subroutine Call
Subroutine Return
PC ← PC + k + 1
PC ← PC + k + 1
PC ← STACK
PC ← STACK
None
None
None
I
2
3
4
4
RETI
Interrupt Return
CPSE
CP
CPC
Rd, Rr
Rd, Rr
Rd, Rr
Rd, K
Rr, b
Rr, b
P, b
P, b
s, k
s, k
k
k
k
k
k
k
k
k
k
k
k
k
k
k
k
k
k
Compare, Skip if Equal
Compare
Compare with Carry
if (Rd = Rr) PC ← PC + 2 or 3
Rd - Rr
Rd - Rr - C
None
Z,N,V,C,H
Z,N,V,C,H
Z,N,V,C,H
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
1/2
1
1
CPI
Compare Register with Immediate
Skip if Bit in Register Cleared
Skip if Bit in Register is Set
Skip if Bit in I/O Register Cleared
Skip if Bit in I/O Register is Set
Branch if Status Flag Set
Branch if Status Flag Cleared
Branch if Equal
Branch if Not Equal
Branch if Carry Set
Branch if Carry Cleared
Branch if Same or Higher
Branch if Lower
Rd - K
1
SBRC
SBRS
SBIC
SBIS
if (Rr(b) = 0) PC ← PC + 2 or 3
if (Rr(b) = 1) PC ← PC + 2 or 3
if (P(b)= 0) PC ← PC + 2 or 3
if (P(b) = 1) PC ← PC + 2 or 3
if (SREG(s) = 1) then PC ← PC + k + 1
if (SREG(s) = 0) then PC ← PC + k + 1
if (Z = 1) then PC ← PC + k + 1
if (Z = 0) then PC ← PC + k + 1
if (C = 1) then PC ← PC + k + 1
if (C = 0) then PC ← PC + k + 1
if (C = 0) then PC ← PC + k + 1
if (C = 1) then PC ← PC + k + 1
if (N = 1) then PC ← PC + k + 1
if (N = 0) then PC ← PC + k + 1
if (N ⊕ V = 0) then PC ← PC + k + 1
if (N ⊕ V = 1) then PC ← PC + k + 1
if (H = 1) then PC ← PC + k + 1
if (H = 0) then PC ← PC + k + 1
if (T = 1) then PC ← PC + k + 1
if (T = 0) then PC ← PC + k + 1
if (V = 1) then PC ← PC + k + 1
if (V = 0) then PC ← PC + k + 1
if (I = 1) then PC ← PC + k + 1
if (I = 0) then PC ← PC + k + 1
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
BRBS
BRBC
BREQ
BRNE
BRCS
BRCC
BRSH
BRLO
BRMI
BRPL
BRGE
BRLT
BRHS
BRHC
BRTS
BRTC
BRVS
BRVC
BRIE
Branch if Minus
Branch if Plus
Branch if Greater or Equal, Signed
Branch if Less than Zero, Signed
Branch if Half-carry Flag Set
Branch if Half-carry Flag Cleared
Branch if T-Flag Set
Branch if T-Flag Cleared
Branch if Overflow Flag is Set
Branch if Overflow Flag is Cleared
Branch if Interrupt Enabled
Branch if Interrupt Disabled
BRID
k
DATA TRANSFER INSTRUCTIONS
LD
ST
MOV
LDI
IN
Rd, Z
Z, Rr
Rd, Rr
Rd, K
Rd, P
P, Rr
Load Register Indirect
Store Register Indirect
Move between Registers
Load Immediate
In Port
Rd ← (Z)
(Z) ← Rr
Rd ← Rr
Rd ← K
Rd ← P
P ← Rr
None
None
None
None
None
None
2
2
1
1
1
1
OUT
Out Port
63
0838H–AVR–03/02
ATMEL [ ATMEL ]
