COP881C Datasheet, PDF (20/30 Pages) National Semiconductor (TI) – Microcontrollers

Instruction Execution Time
Most instructions are single byte (with immediate address-
ing 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
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
ADD
ADC
SUBC
AND
OR
XOR
IFEQ
IFGT
IFBNE
DRSZ
SBIT
RBIT
IFBIT
Arithmetic and Logic Instructions
B
Direct
11
34
11
34
11
34
11
34
11
34
11
34
11
34
11
34
11
13
11
34
11
34
11
34
Immed
22
22
22
22
22
22
22
22
Memory Transfer Instructions
Register
Register Indirect
Indirect Direct Immed Auto Incr Decr
BX
Ba Bb Xa Xb
XA
11 13 23
12
LD A
11 13 23 22
12
LD B Imm
11
LD B Imm
23
LD Mem Imm 2 2 3 3
22
LD Reg Imm
23
13
13
(If B ^k 16)
(If B ^l 15)
el Memory location addressed by B or X or directly
Instructions Using A C
CLRA
11
INCA
11
DECA
11
LAID
13
DCORA
11
RRCA
11
SWAPA
11
SC
11
RC
11
IFC
11
IFNC
11
Transfer of Control Instructions
JMPL
34
JMP
23
JP
13
JSRL
35
JSR
25
JID
13
RET
15
RETSK
15
RETI
15
INTR
17
NOP
11
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