COP87L84BC Datasheet, PDF (49/54 Pages) National Semiconductor (TI) – 8-Bit CMOS OTP Microcontrollers with 16k Memory, Comparators, and CAN Interface

Instruction Execution Time
Most instructions are single byte (with immediate addressing
mode instructions taking two bytes).
Most single byte 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.
Arithmetic and Logic Instructions
ADD
ADC
SUBC
AND
OR
XOR
IFEQ
IFGT
IFBNE
DRSZ
SBIT
RBIT
IFBIT
[B]
Direct
1/1
3/4
1/1
3/4
1/1
3/4
1/1
3/4
1/1
3/4
1/1
3/4
1/1
3/4
1/1
3/4
1/1
1/3
1/1
3/4
1/1
3/4
1/1
3/4
RPND
1/1
Immed.
2/2
2/2
2/2
2/2
2/2
2/2
2/2
2/2
Instructions Using A and C
CLRA
1/1
INCA
1/1
DECA
1/1
LAID
1/3
DCORA
1/1
RRCA
1/1
RLCA
1/1
SWAPA
1/1
SC
1/1
RC
1/1
IFC
1/1
IFNC
1/1
PUSHA
1/3
POPA
1/3
ANDSZ
2/2
Transfer of Control
Instructions
JMPL
3/4
JMP
2/3
JP
1/3
JSRL
3/5
JSR
2/5
JID
1/3
VIS
1/5
RET
1/5
RETSK
1/5
RETI
1/5
INTR
1/7
NOP
1/1
Memory Transfer Instructions
X A, (Note 17)
LD A, (Note 17)
LD B, Imm
LD B, Imm
LD Mem, Imm
LD Reg, Imm
IFEQ MD, Imm
Register
Indirect
[B]
[X]
1/1
1/3
1/1
1/3
2/2
Note 17: > Memory location addressed by B or X or directly.
Direct Immed.
2/3
2/3
2/2
1/1
2/3
3/3
2/3
3/3
Register Indirect
Auto Incr. and Decr.
[B+, B−] [X+, X−]
1/2
1/3
1/2
1/3
2/2
(IF B < 16)
(IF B > 15)
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