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Microcontrollers
Some basic command codes for 68HC11 micro
35
Electrical Engineering
Undergraduate 4
10/02/2012

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Cards

Term
LDAA, LDAB, LDX, LDY
Definition
Load Accumulator or Index Register
Term
STAA, STAB, STX, STY
Definition
Store Accumulator or Index Register in Memory
Term
ADDA, ADDB
Definition
Add memory to Accumulator
Term
ABA, ABX
Definition
Add Accumulator B to Accumulator A (or X)
Term
SUBA, SUBB
Definition
Subtract memory from Accumulator
Term
SBA
Definition
Subtract Accumulator B from Accumulator A
Term
INC, INCA, INCB, INX, INY
Definition
Increment memory (or register)
Term
DEC, DECA, DECB, DEX, DEY
Definition
Decrement memory (or register)
Term
Negative Flag
Definition
N
Term
Zero Flag
Definition
Z
Term
2's Compliment Flag
Definition
V
Term
Carry Flag
Definition
C
Term
adds the value to Accumulator A taking into account the current value of the Carry Flag.
Definition
ADCA (ADCB for accumulator B)
Term
Set the Carry Flag (Overflow Flag)
Definition
SEC, SEV
Term
Clear the Carry Flag (Overflow Flag)
Definition
CLC, CLV
Term
Test memory (or Accumulator)
Definition
TST, TSTA, TSTB
Term
Branch if Carry Flag Set (Clear)
Definition
BCS, (BCC)
Term
Branch if Overflow Flag Set (Clear)
Definition
BVS, (BVC)
Term
Branch if Zero Flag Set (Clear)
Definition
BEQ, (BNE)
Term
Branch if Negative Flag Set (Clear)
Definition
BMI, (BPL)
Term
Branch always
Definition
BRA
Term
Branch if greater than (signed)
Definition
BGT
Term
Branch if greater than or equal to (signed)
Definition
BGE
Term
Branch if less than or equal to (signed)
Definition
BLE
Term
Branch if less than (signed)
Definition
BLT
Term
Branch if lower than (unsigned)
Definition
BLO
Term
Branch if lower than or same (unsigned)
Definition
BLS
Term
Branch if higher than or same (unsigned)
Definition
BHS
Term
Branch if higher than (unsigned)
Definition
BHI
Term
logical ending to program
Definition
END
Term
Assign a meaningful label to a memory location
Definition
EQU
Term
Allocate and fill sequential memory bytes
Definition
FCB
Term
Allocate and fill sequential memory double bytes
Definition
FDB
Term
Set the current memory location. This location is used to place subsequent bytes of code in memory.
Definition
ORG
Term
Allocate (but don’t fill) memory bytes
Definition
RMB
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