cop87l42rj National Semiconductor Corporation, cop87l42rj Datasheet - Page 22

• Manufacturer Part Number: cop87l42rj
• Description: 8-bit Cmos Otp Microcontrollers With 4k Or 32k Memory And Comparator
• Manufacturer: National Semiconductor Corporation

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*
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 Instructions (Bytes/Cycles)
Memory Transfer Instructions (Bytes/Cycles)
Instructions Using A & C
X A,
LD A,
LD B,Imm
LD B,Imm
LD Mem,Imm
LD Reg,Imm
=
>
Memory location addressed by B or X or directly.
*
*
CLRA
INCA
DECA
LAID
DCORA
RRCA
SWAPA
SC
RC
IFC
IFNC
Instructions
ADD
ADC
SUBC
AND
OR
XOR
IFEQ
IFGT
IFBNE
DRSZ
SBIT
RBIT
IFBIT
Register
[B] [X]
1/1 1/3
1/1 1/3
Indirect
Bytes/Cycles
1/1
1/1
1/1
1/3
1/1
1/1
1/1
1/1
1/1
1/1
1/1
Direct
2/3
2/3
3/3
[B]
1/1
1/1
1/1
1/1
1/1
1/1
1/1
1/1
1/1
1/1
1/1
1/1
22
Immed.
2/2
1/1
2/3
2/3
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.
Transfer of Control Instructions
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
JMPL
JMP
JP
JSRL
JSR
JID
RET
RETSK
RETI
INTR
NOP
[B+, B−]
Instructions
1/2
1/2
2/2
Register Indirect
Auto Incr & Decr
Immed.
2/2
2/2
2/2
2/2
2/2
2/2
2/2
2/2
[X+, X−]
1/3
1/3
Bytes/Cycles
3/4
2/3
1/3
3/5
2/5
1/3
1/5
1/5
1/5
1/7
1/1
(If B
(If B
>
<
15)
16)