cop888eb National Semiconductor Corporation, cop888eb Datasheet - Page 69

• Manufacturer Part Number: cop888eb
• Description: 8-bit Cmos Rom Based Microcontrollers With 8k Memory, Can Interface, 8-bit A/d, And Usart
• Manufacturer: National Semiconductor Corporation

Note 34: =
Instruction Set
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
Memory Transfer Instructions
ADD
ADC
SUBC
AND
OR
XOR
IFEQ
IFGT
IFBNE
DRSZ
SBIT
RBIT
IFBIT
RPND
>
Memory location addressed by B or X or directly.
X A, (Note 34)
LD A, (Note 34)
LD B, Imm
LD B, Imm
LD Mem, Imm
LD Reg, Imm
IFEQ MD, Imm
[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
1/1
(Continued)
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
[B]
1/1
1/1
2/2
Register
Indirect
[X]
1/3
1/3
Immed.
2/2
2/2
2/2
2/2
2/2
2/2
2/2
2/2
Direct
2/3
2/3
3/3
2/3
3/3
Immed.
69
2/2
1/1
2/3
Instructions Using A and C
Transfer of Control Instructions
CLRA
INCA
DECA
LAID
DCORA
RRCA
RLCA
SWAPA
SC
RC
IFC
IFNC
PUSHA
POPA
ANDSZ
JMPL
JMP
JP
JSRL
JSR
JID
VIS
RET
RETSK
RETI
INTR
NOP
Auto Incr. and Decr.
[B+, B−]
Register Indirect
1/2
1/2
2/2
[X+, X−]
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
3/4
2/3
1/3
3/5
2/5
1/3
1/5
1/5
1/5
1/5
1/7
1/1
1/3
1/3
(IF B
(IF B
<
>
16)
15)
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