COP880C Datasheet, PDF (21/31 Pages) National Semiconductor (TI) – Microcontrollers

Instruction Execution Time
Most instructions are single byte (with immediate addressing
mode instruction taking two bytes).
Most single instructions take one cycle time to execute.
Skipped instructions require x number of cycles to be
skipped, where x equals the number of bytes in the skipped
instruction opcode.
Arithmetic and Logic Instructions
[B]
ADD
1/1
ADC
1/1
SUBC
1/1
AND
1/1
OR
1/1
XOR
1/1
IFEQ
1/1
IFGT
1/1
IFBNE
1/1
DRSZ
SBIT
1/1
RBIT
1/1
IFBIT
1/1
See the BYTES and CYCLES per INSTRUCTION table for
details.
BYTES and CYCLES per
INSTRUCTION
The following table shows the number of bytes and cycles for
each instruction in the format of byte/cycle.
Direct
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
1/3
3/4
3/4
3/4
Immed.
2/2
2/2
2/2
2/2
2/2
2/2
2/2
2/2
Memory Transfer Instructions
X A, (Note 24)
LD A, (Note 24)
LD B,Imm
LD B,Imm
LD Mem,Imm
LD Reg,Imm
Register
Indirect
[B] [X]
1/1 1/3
1/1 1/3
2/2
Direct
2/3
2/3
3/3
Note 24: => Memory location addressed by B or X or directly.
Instructions Using A & C
CLRA
1/1
INCA
1/1
DECA
1/1
LAID
1/3
DCORA
1/1
RRCA
1/1
SWAPA
1/1
SC
1/1
RC
1/1
IFC
1/1
IFNC
1/1
Transfer of Control Instructions
JMPL
3/4
Immed.
2/2
1/1
2/3
2/3
Register Indirect
Auto Incr & Decr
[B+, B−] [X+, X−]
1/2
1/3
1/2
1/3
2/2
(If B < 16)
(If B > 15)
JMP
2/3
JP
1/3
JSRL
3/5
JSR
2/5
JID
1/3
RET
1/5
RETSK
1/5
RETI
1/5
INTR
1/7
NOP
1/1
The following table shows the instructions assigned to un-
used opcodes. This table is for information only. The opera-
tions performed are subject to change without notice. Do not
use these opcodes.
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