cop87l88rg National Semiconductor Corporation, cop87l88rg Datasheet - Page 31

• Manufacturer Part Number: cop87l88rg
• Description: 8-bit One-time Programmable Microcontroller With Kbytes Program Memory
• Manufacturer: National Semiconductor Corporation

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
ADD
ADC
SUBC
AND
OR
XOR
IFEQ
IFGT
IFBNE
DRSZ
SBIT
RBIT
IFBIT
RPND
Logic and Arithmetic Instructions
X A
LD A
LD B Imm
LD B Imm
LD Mem Imm
LD Reg Imm
IFEQ MD Imm
e
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
B
l
Memory location addressed by B or X or directly
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
1 1
1 1
2 2
B
Register
Indirect
1 3
1 3
2 2
X
Immed
Memory Transfer Instructions
2 2
2 2
2 2
2 2
2 2
2 2
2 2
2 2
Direct Immed
2 3
2 3
3 3
2 3
3 3
2 2
1 1
2 3
31
Instructions Using A and C
CLRA
INCA
DECA
LAID
DCORA
RRCA
RLCA
SWAPA
SC
RC
IFC
IFNC
PUSHA
POPA
ANDSZ
B
Auto Incr and Decr
a
Register Indirect
1 2
1 2
2 2
B
b
X
a
1 3
1 3
1 1
1 1
1 1
1 3
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 3
1 3
2 2
X
b
(IF B
(IF B
Transfer of Control
JMPL
JMP
JP
JSRL
JSR
JID
VIS
RET
RETSK
RETI
INTR
NOP
k
l
16)
15)
Instructions
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3 4
2 3
1 3
3 5
2 5
1 3
1 5
1 5
1 5
1 5
1 7
1 1