DCD DR805X

DR805X
8-bit RISC Microcontroller
Instructions set details
ver 3.10
DR805x Instructions set details
-2Contents
1.
Overview ____________________________________________________________ 6
1.1. Document structure. ________________________________________________________6
2.
Instructions set brief___________________________________________________ 6
2.1. Instruction set notes ________________________________________________________6
2.2. Instruction set brief – functional order _________________________________________7
2.2.1.
2.2.2.
2.2.3.
2.2.4.
2.2.5.
Arithmetic operations ___________________________________________________________ 7
Logic operations _______________________________________________________________ 8
Boolean manipulation___________________________________________________________ 8
Data transfers_________________________________________________________________ 9
Program branches ____________________________________________________________ 10
2.3. Instruction set brief – hexadecimal order ______________________________________11
3.
Instructions set details ________________________________________________ 14
3.1. ACALL __________________________________________________________________14
3.2. ADD_____________________________________________________________________15
3.2.1.
3.2.2.
3.2.3.
3.2.4.
ADD A, Rn __________________________________________________________________
ADD A, direct ________________________________________________________________
ADD A, @Ri _________________________________________________________________
ADD A, #data ________________________________________________________________
15
15
16
16
3.3. ADDC ___________________________________________________________________17
3.3.1.
3.3.2.
3.3.3.
3.3.4.
ADDC A, Rn _________________________________________________________________
ADDC A, direct _______________________________________________________________
ADDC A, @Ri________________________________________________________________
ADDC A, #data_______________________________________________________________
17
17
18
18
3.4. AJMP____________________________________________________________________19
3.5. ANL _____________________________________________________________________20
3.5.1.
3.5.2.
3.5.3.
3.5.4.
3.5.5.
3.5.6.
3.5.7.
3.5.8.
ANL A, Rn __________________________________________________________________
ANL A, direct ________________________________________________________________
ANL A, @Ri _________________________________________________________________
ANL A, #data ________________________________________________________________
ANL direct, A ________________________________________________________________
ANL direct, #data _____________________________________________________________
ANL C, bit___________________________________________________________________
ANL C, /bit __________________________________________________________________
20
20
21
21
21
21
22
22
3.6. CJNE ____________________________________________________________________23
3.6.1.
3.6.2.
3.6.3.
3.6.4.
CJNE A, direct, rel ____________________________________________________________
CJNE A, #data, rel ____________________________________________________________
CJNE RN, #data, rel___________________________________________________________
CJNE @Ri, #data, rel __________________________________________________________
23
24
24
25
3.7. CLR _____________________________________________________________________26
3.7.1.
3.7.2.
3.7.3.
CLR A______________________________________________________________________ 26
CLR bit ____________________________________________________________________ 26
CLR C _____________________________________________________________________ 27
3.8. CPL _____________________________________________________________________28
3.8.1.
3.8.2.
3.8.3.
CPL A______________________________________________________________________ 28
CPL bit _____________________________________________________________________ 28
CPL C______________________________________________________________________ 29
3.9. DA ______________________________________________________________________30
3.10.
DEC ___________________________________________________________________31
All trademarks mentioned in this document
are trademarks of their respective owners.
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
DR805x Instructions set details
3.10.1.
3.10.2.
3.10.3.
3.10.4.
-3-
DEC A _____________________________________________________________________
DEC Rn ____________________________________________________________________
DEC direct __________________________________________________________________
DEC @Ri ___________________________________________________________________
31
31
32
32
3.11.
DIV____________________________________________________________________33
3.12.
DJNZ __________________________________________________________________34
3.12.1. DJNZ Rn, rel_________________________________________________________________ 34
3.12.2. DJNZ direct, rel ______________________________________________________________ 35
3.13.
INC ___________________________________________________________________36
3.13.1.
3.13.2.
3.13.3.
3.13.4.
3.13.5.
INC A ______________________________________________________________________
INC Rn _____________________________________________________________________
INC direct ___________________________________________________________________
INC @Ri ____________________________________________________________________
INC DPTR __________________________________________________________________
36
36
37
37
37
3.14.
JB ____________________________________________________________________38
3.15.
JBC ___________________________________________________________________39
3.16.
JC ____________________________________________________________________40
3.17.
JMP ___________________________________________________________________41
3.18.
JNB ___________________________________________________________________42
3.19.
JNC ___________________________________________________________________43
3.20.
JNZ ___________________________________________________________________44
3.21.
JZ ____________________________________________________________________45
3.22.
LCALL_________________________________________________________________46
3.23.
LJMP __________________________________________________________________47
3.24.
MOV __________________________________________________________________48
3.24.1. MOV A, Rn __________________________________________________________________
3.24.2. MOV A, direct ________________________________________________________________
3.24.3. MOV A, @Ri_________________________________________________________________
3.24.4. MOV A, #data________________________________________________________________
3.24.5. MOV Rn, A __________________________________________________________________
3.24.6. MOV Rn, direct_______________________________________________________________
3.24.7. MOV Rn, #data_______________________________________________________________
3.24.8. MOV direct, A ________________________________________________________________
3.24.9. MOV direct, Rn_______________________________________________________________
3.24.10. MOV direct, direct __________________________________________________________
3.24.11. MOV direct, @Ri ___________________________________________________________
3.24.12. MOV direct, #data __________________________________________________________
3.24.13. MOV @Ri, A ______________________________________________________________
3.24.14. MOV @Ri, direct ___________________________________________________________
3.24.15. MOV @Ri, #data ___________________________________________________________
3.24.16. MOV C, bit ________________________________________________________________
3.24.17. MOV bit, C ________________________________________________________________
3.24.18. MOV DPTR, #data16 ________________________________________________________
3.25.
48
48
49
49
49
49
50
50
50
50
51
51
51
51
52
52
52
53
MOVC _________________________________________________________________54
3.25.1. MOVC A, @A + DPTR _________________________________________________________ 54
3.25.2. MOVC A, @A + PC ___________________________________________________________ 54
3.26.
MOVX _________________________________________________________________55
3.26.1. MOVX A, @Ri _______________________________________________________________ 55
3.26.2. MOVX A, @DPTR ____________________________________________________________ 55
3.26.3. MOVX @Ri, A _______________________________________________________________ 56
All trademarks mentioned in this document
are trademarks of their respective owners.
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
DR805x Instructions set details
-4-
3.26.4. MOVX @DPTR, A ____________________________________________________________ 56
3.27.
MUL___________________________________________________________________57
3.28.
NOP___________________________________________________________________58
3.29.
ORL ___________________________________________________________________59
3.29.1.
3.29.2.
3.29.3.
3.29.4.
3.29.5.
3.29.6.
3.29.7.
3.29.8.
ORL A, Rn __________________________________________________________________
ORL A, direct ________________________________________________________________
ORL A, @Ri _________________________________________________________________
ORL A, #data ________________________________________________________________
ORL direct, A ________________________________________________________________
ORL direct, #data _____________________________________________________________
ORL C, bit __________________________________________________________________
ORL C, /bit __________________________________________________________________
59
59
60
60
60
60
61
61
3.30.
POP ___________________________________________________________________62
3.31.
PUSH__________________________________________________________________63
3.32.
RET ___________________________________________________________________64
3.33.
RETI __________________________________________________________________65
3.34.
RL ____________________________________________________________________66
3.35.
RLC ___________________________________________________________________67
3.36.
RR ____________________________________________________________________68
3.37.
RRC___________________________________________________________________69
3.38.
SETB __________________________________________________________________70
3.38.1. SETB C ____________________________________________________________________ 70
3.38.2. SETB bit ____________________________________________________________________ 70
3.39.
SJMP__________________________________________________________________71
3.40.
SUBB _________________________________________________________________72
3.40.1.
3.40.2.
3.40.3.
3.40.4.
SUBB A, Rn _________________________________________________________________
SUBB A, direct _______________________________________________________________
SUBB A, @Ri ________________________________________________________________
SUBB A, #data _______________________________________________________________
72
72
73
73
3.41.
SWAP _________________________________________________________________74
3.42.
XCH ___________________________________________________________________75
3.42.1. XCH A, Rn __________________________________________________________________ 75
3.42.2. XCH A, direct ________________________________________________________________ 75
3.42.3. XCH A, @Ri _________________________________________________________________ 75
3.43.
XCHD _________________________________________________________________76
3.44.
XRL ___________________________________________________________________77
3.44.1.
3.44.2.
3.44.3.
3.44.4.
3.44.5.
3.44.6.
4.
XRL A, Rn __________________________________________________________________
XRL A, direct ________________________________________________________________
XRL A, @ Ri_________________________________________________________________
XRL A, #data ________________________________________________________________
XRL direct, A ________________________________________________________________
XRL direct, #data _____________________________________________________________
77
77
78
78
78
78
Contacts ____________________________________________________________ 79
All trademarks mentioned in this document
are trademarks of their respective owners.
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
DR805x Instructions set details
-5-
Tables
Table 1. Notes on data addressing modes_______________________________________ 6
Table 2. Notes on program addressing modes ___________________________________ 6
Table 3. Arithmetic operations ________________________________________________ 7
Table 4. Logic operations ____________________________________________________ 8
Table 5. Boolean manipulation ________________________________________________ 8
Table 6. Data transfer_______________________________________________________ 9
Table 7. Program branches _________________________________________________ 10
Table 8. Instruction set brief in hexadecimal order________________________________ 13
All trademarks mentioned in this document
are trademarks of their respective owners.
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
-6-
DR805x Instructions set details
1. OVERVIEW
1.1. DOCUMENT STRUCTURE.
Document contains brief description of DR805X instructions. This manual is intended
for design engineers who are planning to use the DR805X HDL core in conjunction with
software assembler, compiler and debugger tools.
2. INSTRUCTIONS SET BRIEF
2.1. INSTRUCTION SET NOTES
The DR805X has five different addressing modes: immediate, direct, register, indirect
and relative. In the immediate addressing mode the data is contained in the opcode. By
direct addressing an eight bit address is a part of the opcode, by register addressing, a
register is selected in the opcode for the operation. In the indirect addressing mode, a
register is selected in the opcode to point to the address used by the operation. The
relative addressing mode is used for jump instructions.
The following tables give a survey about the instruction set cycles of the DR805X
microcontroller core. One cycle is equal to one clock period.
Table 1 and Table 2 contain notes for mnemonics used in Instruction set tables. Tables 3 7 show instruction hexadecimal codes, number of bytes and machine cycles that each
instruction takes to execute.
Rn
direct
@Ri
#data
#data 16
bit
A
B
C
Working register R0-R7
128 internal RAM locations, any Special Function Registers
Indirect internal or external RAM location addressed by register R0 or R1
8-bit constant included in instruction
16-bit constant included as bytes 2 and 3 of instruction
256 software flags, any bit-addressable l/O pin, control or status bit
Accumulator
B working register
Carry flag
Table 1. Notes on data addressing modes
addr16
addr11
rel
Destination address for LCALL and LJMP may be anywhere within the 64-Kbyte of
program memory address space.
Destination address for ACALL and AJMP will be within the same 2-Kbyte page of
program memory as the first byte of the following instruction.
SJMP and all conditional jumps include an 8-bit offset byte. Range is +127/-128
bytes relative to the first byte of the following instruction
Table 2. Notes on program addressing modes
All trademarks mentioned in this document
are trademarks of their respective owners.
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
-7-
DR805x Instructions set details
2.2. INSTRUCTION SET BRIEF – FUNCTIONAL ORDER
2.2.1. ARITHMETIC OPERATIONS
Mnemonic
ADD A,Rn
ADD A,direct
ADD A,@Ri
ADD A,#data
ADDC A,Rn
ADDC A,direct
ADDC A,@Ri
ADDC A,#data
SUBB A,Rn
SUBB A,direct
SUBB A,@Ri
SUBB A,#data
INC A
INC Rn
INC direct
INC @Ri
DEC A
DEC Rn
DEC direct
DEC @Ri
INC DPTR
MUL A,B
DIV A,B
DA A
Description
Code
Add register to accumulator
Add direct byte to accumulator
Add indirect RAM to accumulator
Add immediate data to accumulator
Add register to accumulator with carry flag
Add direct byte to A with carry flag
Add indirect RAM to A with carry flag
Add immediate data to A with carry flag
Subtract register from A with borrow
Subtract direct byte from A with borrow
Subtract indirect RAM from A with borrow
Subtract immediate data from A with borrow
Increment accumulator
Increment register
Increment direct byte
Increment indirect RAM
Decrement accumulator
Decrement register
Decrement direct byte
Decrement indirect RAM
Increment data pointer
Multiply A and B
Divide A by B
Decimal adjust accumulator
0x28-0x2F
0x25
0x26-0x27
0x24
0x38-0x3F
0x35
0x36-0x37
0x34
0x98-0x9F
0x95
0x96-0x97
0x94
0x04
0x08-0x0F
0x05
0x06-0x07
0x14
0x18-0x1F
0x15
0x16-0x17
0xA3
0xA4
0x84
0xD4
Bytes Cycles
1
2
1
2
1
2
1
2
1
2
1
2
1
1
2
1
1
1
1
2
1
1
1
1
2
3
3
2
2
3
3
2
2
3
3
2
2
3
4
4
2
3
4
4
1
4
5
4
Table 3. Arithmetic operations
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are trademarks of their respective owners.
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
-8-
DR805x Instructions set details
2.2.2. LOGIC OPERATIONS
Mnemonic
ANL A,Rn
ANL A,direct
ANL A,@Ri
ANL A,#data
ANL direct,A
ANL direct,#data
ORL A,Rn
ORL A,direct
ORL A,@Ri
ORL A,#data
ORL direct,A
ORL direct,#data
XRL A,Rn
XRL A,direct
XRL A,@Ri
XRL A,#data
XRL direct,A
XRL direct,#data
CLR A
CPL A
RL A
RLC A
RR A
RRC A
SWAP A
Description
Code
AND register to accumulator
AND direct byte to accumulator
AND indirect RAM to accumulator
AND immediate data to accumulator
AND accumulator to direct byte
AND immediate data to direct byte
OR register to accumulator
OR direct byte to accumulator
OR indirect RAM to accumulator
OR immediate data to accumulator
OR accumulator to direct byte
OR immediate data to direct byte
Exclusive OR register to accumulator
Exclusive OR direct byte to accumulator
Exclusive OR indirect RAM to accumulator
Exclusive OR immediate data to accumulator
Exclusive OR accumulator to direct byte
Exclusive OR immediate data to direct byte
Clear accumulator
Complement accumulator
Rotate accumulator left
Rotate accumulator left through carry
Rotate accumulator right
Rotate accumulator right through carry
Swap nibbles within the accumulator
0x58-0x5F
0x55
0x56-0x57
0x54
0x52
0x53
0x48-0x4F
0x45
0x46-0x47
0x44
0x42
0x43
0x68-0x6F
0x65
0x66-0x67
0x64
0x62
0x63
0xE4
0xF4
0x23
0x33
0x03
0x13
0xC4
Bytes Cycles
1
2
1
2
2
3
1
2
1
2
2
3
1
2
1
2
2
3
1
1
1
1
1
1
1
2
3
3
2
4
4
2
3
3
2
4
4
2
3
3
2
4
4
1
2
1
1
1
1
1
Table 4. Logic operations
2.2.3. BOOLEAN MANIPULATION
Mnemonic
CLR C
CLR bit
SETB C
SETB bit
CPL C
CPL bit
ANL C,bit
ANL C,/bit
ORL C,bit
ORL C,/bit
MOV C,bit
MOV bit,C
Description
Code
Clear carry flag
Clear direct bit
Set carry flag
Set direct bit
Complement carry flag
Complement direct bit
AND direct bit to carry flag
AND complement of direct bit to carry
OR direct bit to carry flag
OR complement of direct bit to carry
Move direct bit to carry flag
Move carry flag to direct bit
0xC3
0xC2
0xD3
0xD2
0xB3
0xB2
0x82
0xB0
0x72
0xA0
0xA2
0x92
Bytes Cycles
1
2
1
2
1
2
2
2
2
2
2
2
1
4
1
4
1
4
3
3
3
3
3
4
Table 5. Boolean manipulation
All trademarks mentioned in this document
are trademarks of their respective owners.
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
-9-
DR805x Instructions set details
2.2.4. DATA TRANSFERS
Mnemonic
Description
Code
MOV A,Rn
MOV A,direct
MOV A,@Ri
MOV A,#data
MOV Rn,A
MOV Rn,direct
MOV Rn,#data
Move register to accumulator
Move direct byte to accumulator
Move indirect RAM to accumulator
Move immediate data to accumulator
Move accumulator to register
Move direct byte to register
Move immediate data to register
MOV direct,A
Move accumulator to direct
MOV direct,Rn
Move register to direct
MOV direct1,direct2
Move direct byte to direct
MOV direct,@Ri
Move indirect RAM to direct
MOV direct,#data
MOV @Ri,A
MOV @Ri,direct
MOV @Ri,#data
MOV DPTR,#data16
MOVC A,@A+DPTR
MOVC A,@A+PC
MOVX A,@Ri
MOVX A,@DPTR
MOVX @Ri,A
MOVX @DPTR,A
PUSH direct
Move immediate data to direct byte
Move accumulator to indirect RAM
Move direct byte to indirect RAM
Move immediate data to indirect RAM
Load data pointer with a 16-bit constant
Move code byte relative to DPTR to accumulator
Move code byte relative to PC to accumulator
Move external RAM (8-bit address) to A
Move external RAM (16-bit address) to A
Move A to external RAM (8-bit address)
Move A to external RAM (16-bit address)
Push direct byte onto stack
SFR
Pop direct byte from stack to
RAM
Exchange register with accumulator
Exchange direct byte with accumulator
Exchange indirect RAM with accumulator
Exchange low-order nibble indirect RAM with A
POP direct
XCH A,Rn
XCH A,direct
XCH A,@Ri
XCHD A,@Ri
SFR byte
RAM byte
SFR byte
RAM byte
SFR byte
RAM byte
SFR byte
RAM byte
Bytes Cycles
0xE8-0xEF
0xE5
0xE6-0xE7
0x74
0xF8-0xFF
0xA8-0xAF
0x78-0x7F
1
2
1
2
1
2
2
0xF5
2
0x88-8F
2
85
3
86-87
2
75
F6-F7
A6-A7
76-77
90
93
83
E2-E3
E0
F2-F3
F0
C0
3
1
2
2
3
1
1
1
1
1
1
2
D0
2
C8-CF
C5
C6-C7
D6-D7
1
2
1
1
1
2
2
2
2
4
2
2
3
2
3
3
4
3
4
3
3
4
3
3
4
4
3*
2*
4*
3*
4
2
3
2
3
3
3
Table 6. Data transfer
* MOVX cycles depends on STRETCH register
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are trademarks of their respective owners.
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 10 -
DR805x Instructions set details
2.2.5. PROGRAM BRANCHES
Mnemonic
Description
Code
ACALL addr11
LCALL addr16
RET
RETI
AJMP addr11
LJMP addr16
SJMP rel
JMP @A+DPTR
JZ rel
JNZ rel
Absolute subroutine call
Long subroutine call
Return from subroutine
Return from interrupt
Absolute jump
Long jump
Short jump (relative address)
Jump indirect relative to the DPTR
Jump if accumulator is zero
Jump if accumulator is not zero
JC rel
Jump if carry flag is set
JNC rel
Jump if carry flag is not set
JB bit,rel
JNB bit,rel
JBC bit,direct rel
CJNE A,direct rel
CJNE A,#data rel
CJNE Rn,#data rel
CJNE @Ri,#data rel
DJNZ Rn,rel
DJNZ direct,rel
NOP
Jump if direct bit is set
Jump if direct bit is not set
Jump if direct bit is set and clear bit
Compare direct byte to A and jump if not equal
Compare immediate to A and jump if not equal
Compare immediate to reg. and jump if not equal
Compare immediate to ind. and jump if not equal
Decrement register and jump if not zero
Decrement direct byte and jump if not zero
No operation
C=1
C=0
C=0
C=1
Bytes Cycles
0x11-0xF1
12
22
32
01-E1
02
80
73
60
70
2
3
1
1
2
3
2
1
2
2
40
2
50
2
20
30
10
B5
B4
B8-BF
B6-B7
D8-DF
D5
00
3
3
3
3
3
3
3
2
3
1
6
6
4
4
3
4
3
3
3
3
3
2
3
2
4
4
4
5
4
4
5
4
5
1
Table 7. Program branches
All trademarks mentioned in this document
are trademarks of their respective owners.
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
DR805x Instructions set details
- 11 -
2.3. INSTRUCTION SET BRIEF – HEXADECIMAL ORDER
Opcode
00 H
01 H
02 H
03 H
04 H
05 H
06 H
07 H
08 H
09 H
0A H
0B H
0C H
0D H
0E H
0F H
10 H
11 H
12 H
13 H
14 H
15 H
16 H
17 H
18 H
19 H
1A H
1B H
1C H
1D H
1E H
1F H
20 H
21 H
22 H
23 H
24 H
25 H
26 H
27 H
28 H
29 H
2A H
2B H
2C H
2D H
2E H
2F H
Mnemonic
NOP
AJMP addr11
LJMP addr16
RR A
INC A
INC direct
INC @R0
INC @R1
INC R0
INC R1
INC R2
INC R3
INC R4
INC R5
INC R6
INC R7
JBC bit,rel
ACALL addr11
LCALL addr16
RRC A
DEC A
DEC direct
DEC @R0
DEC @R1
DEC R0
DEC R1
DEC R2
DEC R3
DEC R4
DEC R5
DEC R6
DEC R7
JB bit.rel
AJMP addr11
RET
RL A
ADD A,#data
ADD A,direct
ADD A,@R0
ADD A,@R1
ADD A,R0
ADD A,R1
ADD A,R2
ADD A,R3
ADD A,R4
ADD A,R5
ADD A,R6
ADD A,R7
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are trademarks of their respective owners.
Opcode
30 H
31 H
32 H
33 H
34 H
35 H
36 H
37 H
38 H
39 H
3A H
3B H
3C H
3D H
3E H
3F H
40 H
41 H
42 H
43 H
44 H
45 H
46 H
47 H
48 H
49 H
4A H
4B H
4C H
4D H
4E H
4F H
50 H
51 H
52 H
53 H
54 H
55 H
56 H
57 H
58 H
59 H
5A H
5B H
5C H
5D H
5E H
5F H
Mnemonic
JNB bit.rel
ACALL addr11
RETI
RLC A
ADDC A,#data
ADDC A,direct
ADDC A,@R0
ADDC A,@R1
ADDC A,R0
ADDC A,R1
ADDC A,R2
ADDC A,R3
ADDC A,R4
ADDC A,R5
ADDC A,R6
ADDC A,R7
JC rel
AJMP addr11
ORL direct,A
ORL direct,#data
ORL A,#data
ORL A,direct
ORL A,@R0
ORL A,@R1
ORL A,R0
ORL A,R1
ORL A,R2
ORL A,R3
ORL A,R4
ORL A,R5
ORL A,R6
ORL A,R7
JNC rel
ACALL addr11
ANL direct,A
ANL direct,#data
ANL A,#data
ANL A,direct
ANL A,@R0
ANL A,@R1
ANL A,R0
ANL A,R1
ANL A,R2
ANL A,R3
ANL A,R4
ANL A,R5
ANL A,R6
ANL A,R7
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DR805x Instructions set details
Opcode
60 H
61 H
62 H
63 H
64 H
65 H
66 H
67 H
68 H
69 H
6A H
6B H
6C H
6D H
6E H
6F H
70 H
71 H
72 H
73 H
74 H
75 H
76 H
77 H
78 H
79 H
7A H
7B H
7C H
7D H
7E H
7F H
80 H
81 H
82 H
83 H
84 H
85 H
86 H
87 H
88 H
89 H
8A H
8B H
8C H
8D H
8E H
8F H
Mnemonic
JZ rel
AJMP addr11
XRL direct,A
XRL direct,#data
XRL A,#data
XRL A,direct
XRL A,@R0
XRL A,@R1
XRL A,R0
XRL A,R1
XRL A,R2
XRL A,R3
XRL A,R4
XRL A,R5
XRL A,R6
XRL A,R7
JNZ rel
ACALL addr11
ORL C,direct
JMP @A+DPTR
MOV A,#data
MOV direct,#data
MOV @R0,#data
MOV @R1,#data
MOV R0.#data
MOV R1.#data
MOV R2.#data
MOV R3.#data
MOV R4.#data
MOV R5.#data
MOV R6.#data
MOV R7.#data
SJMP rel
AJMP addr11
ANL C,bit
MOVC A,@A+PC
DIV AB
MOV direct,direct
MOV direct,@R0
MOV direct,@R1
MOV direct,R0
MOV direct,R1
MOV direct,R2
MOV direct,R3
MOV direct,R4
MOV direct,R5
MOV direct,R6
MOV direct,R7
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- 12 Opcode
90 H
91 H
92 H
93 H
94 H
95 H
96 H
97 H
98 H
99 H
9A H
9B H
9C H
9D H
9E H
9F H
A0 H
A1 H
A2 H
A3 H
A4 H
A5 H
A6 H
A7 H
A8 H
A9 H
AA H
AB H
AC H
AD H
AE H
AF H
B0 H
B1 H
B2 H
B3 H
B4 H
B5 H
B6 H
B7 H
B8 H
B9 H
BA H
BB H
BC H
BD H
BE H
BF H
Mnemonic
MOV DPTR,#data16
ACALL addr11
MOV bit,C
MOVC A,@A+DPTR
SUBB A,#data
SUBB A,direct
SUBB A,@R0
SUBB A,@R1
SUBB A,R0
SUBB A,R1
SUBB A,R2
SUBB A,R3
SUBB A,R4
SUBB A,R5
SUBB A,R6
SUBB A,R7
ORL C,bit
AJMP addr11
MOV C,bit
INC DPTR
MUL AB
MOV @R0,direct
MOV @R1,direct
MOV R0,direct
MOV R1,direct
MOV R2,direct
MOV R3,direct
MOV R4,direct
MOV R5,direct
MOV R6,direct
MOV R7,direct
ANL C,bit
ACALL addr11
CPL bit
CPL C
CJNE A,#data,rel
CJNE A,direct,rel
CJNE @R0,#data,rel
CJNE @R1,#data,rel
CJNE R0,#data,rel
CJNE R1,#data,rel
CJNE R2,#data,rel
CJNE R3,#data,rel
CJNE R4,#data,rel
CJNE R5,#data,rel
CJNE R6,#data,rel
CJNE R7,#data,rel
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DR805x Instructions set details
Opcode
C0 H
C1 H
C2 H
C3 H
C4 H
C5 H
C6 H
C7 H
C8 H
C9 H
CA H
CB H
CC H
CD H
CE H
CF H
D0 H
D1 H
D2 H
D3 H
D4 H
D5 H
D6 H
D7 H
D8 H
D9 H
DA H
DB H
DC H
DD H
DE H
DF H
Mnemonic
PUSH direct
AJMP addr11
CLR bit
CLR C
SWAP A
XCH A, direct
XCH A,@R0
XCH A,@R1
XCH A,R0
XCH A,R1
XCH A,R2
XCH A,R3
XCH A,R4
XCH A,R5
XCH A,R6
XCH A,R7
POP direct
ACALL addr11
SETB bit
SETB C
DA A
DJNZ direct, rel
XCHD A,@R0
XCHD A,@R1
DJNZ R0,rel
DJNZ R1,rel
DJNZ R2,rel
DJNZ R3,rel
DJNZ R4,rel
DJNZ R5,rel
DJNZ R6,rel
DJNZ R7,rel
- 13 Opcode
E0 H
E1 H
E2 H
E3 H
E4 H
E5 H
E6 H
E7 H
E8 H
E9 H
EA H
EB H
EC H
ED H
EE H
EF H
F0 H
F1 H
F2 H
F3 H
F4 H
F5 H
F6 H
F7 H
F8 H
F9 H
FA H
FB H
FC H
FD H
FE H
FF H
Mnemonic
MOVX A,@DPTR
AJMP addr11
MOVX A,@R0
MOVX A,@R1
CLR A
MOV A, direct
MOV A,@R0
MOV A,@R1
MOV A,R0
MOV A,R1
MOV A,R2
MOV A,R3
MOV A,R4
MOV A,R5
MOV A,R6
MOV A,R7
MOVX @DPTR,A
ACALL addr11
MOVX @R0,A
MOVX @R1,A
CPL A
MOV direct, A
MOV @R0,A
MOV @R1,A
MOV R0,A
MOV R1,A
MOV R2,A
MOV R3,A
MOV R4,A
MOV R5,A
MOV R6,A
MOV R7,A
Table 8. Instruction set brief in hexadecimal order
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- 14 -
DR805x Instructions set details
3. INSTRUCTIONS SET DETAILS
3.1.
ACALL
Instruction:
ACALL addr11
Function:
Absolute call
Description:
ACALL unconditionally calls a subroutine located at the indicated
address. The instruction increments the PC twice to obtain the address
of the following instruction, then pushes the 16-bit result onto the stack
(low-order byte first) and increments the stack pointer twice. The
destination address is obtained by successively concatenating the five
high-order bits of the incremented PC, op code bits 7-5, and the second
byte of the instruction. The subroutine called must therefore start within
the same 2K block of program memory as the first byte of the
instruction following ACALL. No flags are affected.
Operation:
Bytes:
Cycles:
← (PC) + 2
← (SP) + 1
← (PC7-0)
← (SP) + 1
← (PC15-8)
← page address
(PC)
(SP)
((SP))
(SP)
((SP))
(PC10-0)
2
6
Encoding:
a10 a9
a8
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1
0
0
0
1
a7
a6
a5
a4
a3
a2
a1
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a0
- 15 -
DR805x Instructions set details
3.2.
ADD
Instruction:
ADD A, <src-byte>
Function:
Adds A to the source operand and returns the result to A.
Description:
ADD adds the byte variable indicated to the accumulator, leaving the
result in the accumulator. The carry and auxiliary carry flags are set,
respectively, if there is a carry out of bit 7 or bit 3, and cleared
otherwise. When adding unsigned integers, the carry flag indicates an
overflow occurred. OV is set if there is a carry out of bit 6 but not out of
bit 7, or a carry out of bit 7 but not out of bit 6; otherwise OV is cleared.
When adding signed integers, OV indicates a negative number
produced as the sum of two positive operands, or a positive sum from
two negative operands. Four source operand addressing modes are
allowed: register, direct, register- indirect, or immediate.
3.2.1. ADD A, RN
Operation:
(PC) ← (PC) + 1
(A) ← (A) + (Rn)
Bytes:
Cycles:
1
2
Encoding:
0
0
1
0
1
r
r
r
1
0
1
3.2.2. ADD A, DIRECT
Operation:
(PC) ← (PC) + 2
(A) ← (A) + (direct)
Bytes:
Cycles:
2
3
Encoding:
0
0
1
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0
0
direct address
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DR805x Instructions set details
3.2.3. ADD A, @RI
Operation:
(PC) ← (PC) + 1
(A) ← (A) + ((Ri))
Bytes:
Cycles:
1
3
Encoding:
0
0
1
0
0
1
1
i
0
1
0
0
3.2.4. ADD A, #DATA
Operation:
(PC) ← (PC) + 2
(A) ← (A) + #data
Bytes:
Cycles:
2
2
Encoding:
0
0
1
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0
immediate data
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- 17 -
DR805x Instructions set details
3.3.
ADDC
Instruction:
ADDC A, < src-byte>
Function:
Adds A and the source operand, then adds one (1) if CY is set, and
puts the result in A.
Description:
ADDC simultaneously adds the byte variable indicated, the carry flag
and the accumulator contents, leaving the result in the accumulator.
The carry and auxiliary carry flags are set, respectively, if there is a
carry out of bit 7 or bit 3, and cleared otherwise. When adding unsigned
integers, the carry flag indicates an overflow occurred. OV is set if there
is a carry out of bit 6 but not out of bit 7, or a carry out of bit 7 but not
out of bit 6; otherwise OV is cleared. When adding signed integers, OV
indicates a negative number produced as the sum of two positive
operands or a positive sum from two negative operands. Four source
operand-addressing modes are allowed: register= direct, registerindirect, or immediate.
3.3.1. ADDC A, RN
Operation:
(PC) ← (PC) + 1
(A) ← (A) + (C) + (Rn)
Bytes:
Cycles:
1
2
Encoding:
0
0
1
1
1
r
r
r
0
1
3.3.2. ADDC A, DIRECT
Operation:
(PC) ← (PC) + 2
(A) ← (A) + (C) + (direct)
Bytes:
Cycles:
2
3
Encoding:
0
0
1
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1
0
1
direct address
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DR805x Instructions set details
3.3.3. ADDC A, @RI
Operation:
(PC) ← (PC) + 1
(A) ← (A) + (C) + ((Ri))
Bytes:
Cycles:
1
3
Encoding:
0
0
1
1
0
1
1
i
0
0
3.3.4. ADDC A, #DATA
Operation:
(PC) ← (PC) + 2
(A) ← (A) + (C) + #data
Bytes:
Cycles:
2
2
Encoding:
0
0
1
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1
0
1
immediate data
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DR805x Instructions set details
3.4.
AJMP
Instruction:
AJMP addr11
Function:
Absolute jump
Description:
AJMP transfers program execution to the indicated address, which is
formed at run- time by concatenating the high-order five bits of the PC
(after incrementing the PC twice), op code bits 7-5, and the second byte
of the instruction. The destination must therefore be within the same 2K
block of program memory as the first byte of the instruction following
AJMP.
Operation:
(PC)
← (PC) + 2
(PC10-0) ← page address
Bytes:
Cycles:
2
3
Encoding:
a10 a9
a8
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0
0
0
0
1
a7
a6
a5
a4
a3
a2
a1
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a0
- 20 -
DR805x Instructions set details
3.5.
ANL
Instruction:
ANL <dest-byte>, <src-byte>
Function:
Logical AND for byte operands
Description:
ANL performs the bit wise logical AND operation between the variables
indicated and stores the results in the destination variable. No flags are
affected (except P, if <dest-byte> = A). The two operands allow six
addressing mode combinations. When the destination is a accumulator,
the source can use register, direct, register-indirect, or immediate
addressing; when the destination is a direct address, the source can be
the accumulator or immediate data.
Note:
When this instruction is used to modify an output port, the value used
as the original port data will be read from the output data latch, not the
input pins.
3.5.1. ANL A, RN
Operation:
(PC) ← (PC) + 1
(A) ← (A) and (Rn)
Bytes:
Cycles:
1
2
Encoding:
0
1
0
1
1
r
r
r
1
0
1
3.5.2. ANL A, DIRECT
Operation:
(PC) ← (PC) + 2
(A) ← (A) and (direct)
Bytes:
Cycles:
2
3
Encoding:
0
1
0
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1
0
direct address
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DR805x Instructions set details
3.5.3. ANL A, @RI
Operation:
(PC) ← (PC) + 1
(A) ← (A) and ((Ri))
Bytes:
Cycles:
1
3
Encoding:
0
1
0
1
0
1
1
i
1
0
0
immediate data
1
0
direct address
1
1
3.5.4. ANL A, #DATA
Operation:
(PC) ← (PC) + 2
(A) ← (A) and #data
Bytes:
Cycles:
2
2
Encoding:
0
1
0
1
0
3.5.5. ANL DIRECT, A
Operation:
(PC) ← (PC) + 2
(direct) ← (direct) and (A)
Bytes:
Cycles:
2
4
Encoding:
0
1
0
1
0
0
3.5.6. ANL DIRECT, #DATA
Operation:
(PC) ← (PC) + 3
(direct) ← (direct) and #data
Bytes:
Cycles:
3
4
Encoding:
0
Instruction:
1
0
1
0
0
direct address
immediate data
ANL C, <src-bit>
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DR805x Instructions set details
Function:
Logical AND for bit operands
Description:
If the Boolean value of the source bit is a logic 0 then clear the carry
flag; otherwise leave the carry flag in its current state. A slash (“/”
preceding the operand in the assembly language indicates that the
logical complement of the addressed bit is used as the source value,
but the source bit itself is not affected. No other flags are affected. Only
direct bit addressing is allowed for the source operand.
3.5.7. ANL C, BIT
Operation:
(PC) ← (PC) + 2
(C) ← (C) and (bit)
Bytes:
Cycles:
2
3
Encoding:
1
0
0
0
0
0
1
0
bit address
0
0
0
bit address
3.5.8. ANL C, /BIT
Operation:
(PC) ← (PC) + 2
(C) ← (C) and / (bit)
Bytes:
Cycles:
2
3
Encoding:
1
0
1
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1
0
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- 23 -
DR805x Instructions set details
3.6.
CJNE
Instruction:
CJNE <dest-byte >, < src-byte >, rel
Function:
Compare and jump if not equal.
Description:
CJNE compares the magnitudes of the first two operands, and
branches if their values are not equal. The branch destination is
computed by adding the signed relative displacement in the last
instruction byte to the PC, after incrementing the PC to the start of the
next instruction. The carry flag is set if the unsigned integer value of
<dest-byte> is less than the unsigned integer value of <src-byte>;
otherwise, the carry is cleared. Neither operand is affected. The first two
operands allow four addressing mode combinations: the accumulator
may be compared with any directly addressed byte or immediate data,
and any indirect RAM location or working register can be compared with
an immediate constant.
3.6.1. CJNE A, DIRECT, REL
Operation:
(PC) ← (PC) + 3
if (A) < > (direct) then
(PC) ← (PC) + relative offset
if (A) < (direct) then
(C) ← 1
else
(C) ← 0
Bytes:
Cycles:
3
5
Encoding:
1
0
1
1
0
1
direct address
relative address
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0
1
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DR805x Instructions set details
3.6.2. CJNE A, #DATA, REL
Operation:
(PC) ← (PC) + 3
if (A) < > data then
(PC) ← (PC) + relative offset
if (A) < data then
(C) ← 1
else
(C) ← 0
Bytes:
Cycles:
3
4
Encoding:
1
0
1
1
0
1
immediate data
relative address
0
0
3.6.3. CJNE RN, #DATA, REL
Operation:
(PC) ← (PC) + 3
if (Rn) < > data then
(PC) ← (PC) + relative offset
if (Rn) < data then
(C) ← 1
else
(C) ← 0
Bytes:
Cycles:
3
4
Encoding:
1
0
1
1
1
r
immediate data
relative address
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r
r
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DR805x Instructions set details
3.6.4. CJNE @RI, #DATA, REL
Operation:
(PC) ← (PC) + 3
if ((Ri)) < > data then
(PC) ← (PC) + relative offset
if ((Ri)) < data then
(C) ← 1
else
(C) ← 0
Bytes:
Cycles:
3
5
Encoding:
1
0
1
1
0
1
immediate data
relative address
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1
i
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DR805x Instructions set details
3.7.
CLR
3.7.1. CLR A
Function:
Clear accumulator
Description: The accumulator is cleared (all bits set to zero). No flags are affected.
Operation:
(PC) ← (PC) + 1
(A) ← 0
Bytes:
Cycles:
1
1
Encoding:
1
3.7.2. CLR
Function:
1
1
0
0
1
0
0
BIT
Clear bit
Description: The indicated bit is cleared (reset to zero). No other flags are affected.
Operation:
(PC) ← (PC) + 2
bit ← 0
Bytes:
Cycles:
2
4
Encoding:
1
1
0
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0
0
0
1
0
bit address
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- 27 -
DR805x Instructions set details
3.7.3. CLR C
Function:
Clear carry
Description: The carry flag is cleared (reset to zero). No other flags are affected.
Operation:
(PC) ← (PC) + 1
(C) ← 0
Bytes:
Cycles:
1
1
Encoding:
1
1
0
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0
0
0
1
1
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- 28 -
DR805x Instructions set details
3.8.
CPL
3.8.1. CPL A
Function:
Complement accumulator
Description: Each bit of the accumulator is logically complemented (one’s
complement). Bits which previously contained a one are changed to
zero and vice versa. No flags are affected.
Operation:
(PC) ← (PC) + 1
(A) ← / (A)
Bytes:
Cycles:
1
2
Encoding:
1
1
1
1
0
1
0
0
3.8.2. CPL BIT
Function:
Complement bit
Description: The bit variable specified is complemented. A bit which had been a one
is changed to zero and vice versa. No other flags are affected. CPL can
operate on the carry or any directly addressable bit.
Note:
When this instruction is used to modify an output pin, the value used as
the original data will be read from the output data latch, not the input
pin.
Operation:
(PC) ← (PC) + 2
(C) ← (bit)
Bytes:
Cycles:
2
4
Encoding:
1
0
1
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1
0
0
1
0
bit address
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DR805x Instructions set details
3.8.3. CPL C
Function:
Complement carry
Description: The carry flag is complemented. A bit which had been a one is changed
to zero and vice versa.
Operation:
(PC) ← (PC) + 1
(C) ← / (C)
Bytes:
Cycles:
1
1
Encoding:
1
0
1
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1
0
0
1
1
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- 30 -
DR805x Instructions set details
3.9.
DA
Instruction:
DA A
Function:
Decimal adjust accumulator for addition
Description:
DA A adjusts the eight-bit value in the accumulator resulting from the
earlier addition of two variables (each in packed BCD format),
producing two four-bit digits. Any ADD or ADDC instruction may have
been used to perform the addition. If accumulator bits 3-0 are greater
than nine (xxxx1010-xxxx1111), or if the AC flag is one, six is added to
the accumulator producing the proper BCD digit in the low- order nibble.
This internal addition would set the carry flag if a carry-out of the loworder four-bit field propagated through all high-order bits, but it would
not clear the carry flag otherwise.
If the carry flag is now set, or if the four high-order bits now exceed nine
(1010xxxx-1111xxxx), these high-order bits are incremented by six,
producing the proper BCD digit in the high-order nibble. Again, this
would set the carry flag if there was a carry-out of the high-order bits,
but wouldn't clear the carry. The carry flag thus indicates if the sum of
the original two BCD variables is greater than 100, allowing multiple
precision decimal addition. OV is not affected.
All of this occurs during the one instruction cycle. Essentially; this
instruction performs the decimal conversion by adding 00 H , 06 H , 60
H , or 66 H to the accumulator, depending on initial accumulator and
PSW conditions.
Note:
DA A cannot simply convert a hexadecimal number in the accumulator
to BCD notation, nor does DA A apply to decimal subtraction.
Operation:
(PC) ← (PC) + 1
if [[(A3-0) > 9] ^ [(AC) = 1]] then
(A3-0) ← (A3-0) + 6
next
if [[(A7-4) > 9] ^ [(C) = 1]] then
(A7-4) ← (A7-4) + 6
Bytes:
Cycles:
1
4
Encoding:
1
1
0
All trademarks mentioned in this document
are trademarks of their respective owners.
1
0
1
0
0
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 31 -
DR805x Instructions set details
3.10.
DEC
Instruction:
DEC byte
Function:
Decrement byte
Description:
The variable indicated is decremented by 1. An original value of 00 H
will underflow to 0FF H. No flags are affected. Four operand addressing
modes are allowed: accumulator, register, direct, or register-indirect.
Note:
When this instruction is used to modify an output port, the value used
as the original port data will be read from the output data latch, not the
input pins.
3.10.1.
DEC A
Operation:
(PC) ← (PC) + 1
(A) ← (A) - 1
Bytes:
Cycles:
1
2
Encoding:
0
3.10.2.
0
0
1
0
1
0
0
1
r
r
r
DEC RN
Operation:
(PC) ← (PC) + 1
(Rn) ← (Rn) - 1
Bytes:
Cycles:
1
3
Encoding:
0
0
0
All trademarks mentioned in this document
are trademarks of their respective owners.
1
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 32 -
DR805x Instructions set details
3.10.3.
DEC DIRECT
Operation:
(PC) ← (PC) + 2
(direct) ← (direct) - 1
Bytes:
Cycles:
2
4
Encoding:
0
3.10.4.
0
0
1
0
1
0
1
0
1
1
i
direct address
DEC @RI
Operation:
(PC) ← (PC) + 1
((Ri)) ← ((Ri)) - 1
Bytes:
Cycles:
1
4
Encoding:
0
0
0
All trademarks mentioned in this document
are trademarks of their respective owners.
1
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 33 -
DR805x Instructions set details
3.11.
DIV
Instruction:
DIV AB
Function:
Divide
Description:
DIV AB divides the unsigned eight-bit integer in the accumulator by the
unsigned eight-bit integer in register B. The accumulator receives the
integer part of the quotient; register B receives the integer remainder.
The carry and OV flags will be cleared.
If B had originally contained 00 H, the values returned in the
accumulator and B register will be undefined and the overflow flag will
be set. The carry flag is cleared in any case.
Exception:
Operation:
(PC) ← (PC) + 1
(A15-8) ← (A) / (B) – result’s bits 15..8
(B7-0) ← (A) / (B) – result’s bits 7..0
Bytes:
Cycles:
1
5
Encoding:
1
0
0
All trademarks mentioned in this document
are trademarks of their respective owners.
0
0
1
0
0
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 34 -
DR805x Instructions set details
3.12.
DJNZ
Instruction:
DJNZ <byte>, <rel-addr>
Function:
Decrement and jump if not zero
Description:
DJNZ decrements the location indicated by 1, and branches to the
address indicated by the second operand if the resulting value is not
zero. An original value of 00 H will underflow to 0FF H. No flags are
affected. The branch destination would be computed by adding the
signed relative-displacement value in the last instruction byte to the PC,
after incrementing the PC to the first byte of the following instruction.
The location decremented may be a register or directly addressed byte.
Note:
When this instruction is used to modify an output port, the value used
as the original port data will be read from the output data latch, not the
input pins.
3.12.1.
DJNZ RN, REL
Operation:
(PC) ← (PC) + 2
(Rn) ← (Rn) - 1
if (Rn) ≠ 0 then
(PC) ← (PC) + rel
Bytes:
Cycles:
2
4
Encoding:
1
1
0
All trademarks mentioned in this document
are trademarks of their respective owners.
1
1
r
r
r
relative address
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 35 -
DR805x Instructions set details
3.12.2.
DJNZ DIRECT, REL
Operation:
(PC) ← (PC) + 3
(direct) ← (direct) - 1
if (direct) ≠ 0 then
(PC) ← (PC) + rel
Bytes:
Cycles:
3
5
Encoding:
1
1
0
All trademarks mentioned in this document
are trademarks of their respective owners.
1
0
1
0
direct address
relative address
1
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 36 -
DR805x Instructions set details
3.13.
INC
Instruction:
INC operand
Function:
Increment
Description:
INC increments the indicated variable by 1. An original value of 0FFh
will overflow to 00h. No flags are affected. Three addressing modes are
allowed: register, direct, or register-indirect.
Note:
When this instruction is used to modify an output port, the value used
as the original port data will be read from the output data latch, not the
input pins.
3.13.1.
INC A
Operation:
(PC) ← (PC) + 1
(A) ← (A) + 1
Bytes:
Cycles:
1
2
Encoding:
0
3.13.2.
0
0
0
0
1
0
0
1
r
r
r
INC RN
Operation:
(PC) ← (PC) + 1
(Rn) ← (Rn) + 1
Bytes:
Cycles:
1
3
Encoding:
0
0
0
All trademarks mentioned in this document
are trademarks of their respective owners.
0
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 37 -
DR805x Instructions set details
3.13.3.
INC DIRECT
Operation:
(PC) ← (PC) + 2
(direct) ← (direct) + 1
Bytes:
Cycles:
2
4
Encoding:
0
3.13.4.
0
0
0
0
1
0
1
0
1
1
i
direct address
INC @RI
Operation:
(PC) ← (PC) + 1
((Ri)) ← ((Ri)) + 1
Bytes:
Cycles:
1
4
Encoding:
0
3.13.5.
Function:
0
0
0
INC DPTR
Increment data pointer
Description: Increment the 16-bit data pointer by 1. A 16-bit increment (modulo 2 16)
is performed; an overflow of the low-order byte of the data pointer (DPL)
from 0FF H to 00 H will increment the high-order byte (DPH). No flags
are affected. This is the only 16-bit register which can be incremented.
Operation:
(PC)
← (PC) + 1
(DPTR) ← (DPTR) + 1
Bytes:
Cycles:
1
1
Encoding:
1
0
1
All trademarks mentioned in this document
are trademarks of their respective owners.
0
0
0
1
1
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 38 -
DR805x Instructions set details
3.14.
JB
Instruction:
JB bit, rel
Function:
Jump if bit is set
Description:
If the indicated bit is a one, jump to the address indicated; otherwise
proceed with the next instruction. The branch destination is computed
by adding the signed relative-displacement in the third instruction byte
to the PC, after incrementing the PC to the first byte of the next
instruction. The bit tested is not modified. No flags are affected.
Operation:
(PC) ← (PC) + 3
if (bit) = 1 then
(PC) ← (PC) + rel
Bytes:
Cycles:
3
4
Encoding:
0
0
1
All trademarks mentioned in this document
are trademarks of their respective owners.
0
0
0
0
bit address
relative address
0
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 39 -
DR805x Instructions set details
3.15.
JBC
Instruction:
JBC bit, rel
Function:
Jump if bit is set and clear bit
Description:
If the indicated bit is one, branch to the address indicated; otherwise
proceed with the next instruction. In either case, clear the designated
bit. The branch destination is computed by adding the signed relative
displacement in the third instruction byte to the PC, after incrementing
the PC to the first byte of the next instruction. No flags are affected.
Note:
When this instruction is used to test an output pin, the value used as the
original data will be read from the output data latch, not the input pin.
Operation:
(PC) ← (PC) + 3
if (bit) = 1 then
(bit) ← 0
(PC) ← (PC) + rel
Bytes:
Cycles:
3
4
Encoding:
0
0
0
All trademarks mentioned in this document
are trademarks of their respective owners.
1
0
0
0
bit address
relative address
0
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 40 -
DR805x Instructions set details
3.16.
JC
Instruction:
JC rel
Function:
Jump if carry is set
Description:
If the carry flag is set, branch to the address indicated; otherwise
proceed with the next instruction. The branch destination is computed
by adding the signed relative- displacement in the second instruction
byte to the PC, after incrementing the PC twice. No flags are affected.
Operation:
(PC) ← (PC) + 2
if (C) = 1 then
(PC) ← (PC) + rel
Bytes:
Cycles:
2
3 – C=1
2 – C=0
Encoding:
0
1
0
All trademarks mentioned in this document
are trademarks of their respective owners.
0
0
0
0
0
relative address
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 41 -
DR805x Instructions set details
3.17.
JMP
Instruction:
JMP @A + DPTR
Function:
Jump indirect
Description:
Add the eight-bit unsigned contents of the accumulator with the sixteenbit data pointer, and load the resulting sum to the program counter. This
will be the address for subsequent instruction fetches. Sixteen-bit
addition is performed (modulo 2 16): a carry-out from the low-order
eight bits propagates through the higher-order bits. Neither the
accumulator nor the data pointer is altered. No flags are affected.
Operation:
(PC) ← (A) + (DPTR)
Bytes:
Cycles:
1
3
Encoding:
0
1
1
All trademarks mentioned in this document
are trademarks of their respective owners.
1
0
0
1
1
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 42 -
DR805x Instructions set details
3.18.
JNB
Instruction:
JNB bit,rel
Function:
Jump if bit is not set
Description:
If the indicated bit is a zero, branch to the indicated address; otherwise
proceed with the next instruction. The branch destination is computed
by adding the signed relative-displacement in the third instruction byte
to the PC, after incrementing the PC to the first byte of the next
instruction. The bit tested is not modified. No flags are affected.
Operation:
(PC) ← (PC) + 3
if (bit) = 0 then
(PC) ← (PC) + rel.
Bytes:
Cycles:
3
4
Encoding:
0
0
1
All trademarks mentioned in this document
are trademarks of their respective owners.
1
0
0
0
bit address
relative address
0
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 43 -
DR805x Instructions set details
3.19.
JNC
Instruction:
JNC rel
Function:
Jump if carry is not set
Description:
If the carry flag is a zero, branch to the address indicated; otherwise
proceed with the next instruction. The branch destination is computed
by adding the signed relative-displacement in the second instruction
byte to the PC, after incrementing the PC twice to point to the next
instruction. The carry flag is not modified.
Operation:
(PC) ← (PC) + 2
if (C) = 0 then
(PC) ← (PC) + rel
Bytes:
Cycles:
2
3 – C=0
2 – C=1
Encoding:
0
1
0
All trademarks mentioned in this document
are trademarks of their respective owners.
1
0
0
0
0
relative address
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 44 -
DR805x Instructions set details
3.20.
JNZ
Instruction:
JNZ rel
Function:
Jump if accumulator is not zero
Description:
If any bit of the accumulator is a one, branch to the indicated address;
otherwise proceed with the next instruction. The branch destination is
computed by adding the signed relative-displacement in the second
instruction byte to the PC, after incrementing the PC twice. The
accumulator is not modified. No flags are affected.
Operation:
(PC) ← (PC) + 2
if (A) ≠ 0
then (PC) ← (PC) + rel.
Bytes:
Cycles:
2
3
Encoding:
0
1
1
All trademarks mentioned in this document
are trademarks of their respective owners.
1
0
0
0
0
relative address
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 45 -
DR805x Instructions set details
3.21.
JZ
Instruction:
JZ rel
Function:
Jump if accumulator is zero
Description:
If all bits of the accumulator are zero, branch to the address indicated;
otherwise proceed with the next instruction. The branch destination is
computed by adding the signed relative-displacement in the second
instruction byte to the PC, after incrementing the PC twice. The
accumulator is not modified. No flags are affected.
Operation:
(PC) ← (PC) + 2
if (A) = 0 then
(PC) ← (PC) + rel
Bytes:
Cycles:
2
3
Encoding:
0
1
1
All trademarks mentioned in this document
are trademarks of their respective owners.
0
0
0
0
0
relative address
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 46 -
DR805x Instructions set details
3.22.
LCALL
Instruction:
LCALL addr16
Function:
Long call
Description:
LCALL calls a subroutine located at the indicated address. The
instruction adds three to the program counter to generate the address
of the next instruction and then pushes the 16-bit result onto the stack
(low byte first), incrementing the stack pointer by two. The high-order
and low-order bytes of the PC are then loaded, respectively, with the
second and third bytes of the LCALL instruction. Program execution
continues with the instruction at this address. The subroutine may
therefore begin anywhere in the full 64 Kbyte program memory address
space. No flags are affected.
Operation:
(PC) ← (PC) + 3
(SP) ← (SP) + 1
((SP)) ← (PC7-0)
(SP) ← (SP) + 1
((SP)) ← (PC15-8)
(PC) ← addr15-0
Bytes:
Cycles:
3
6
Encoding:
0
0
0
All trademarks mentioned in this document
are trademarks of their respective owners.
1
0
0
address 15..8
address 7..0
1
0
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 47 -
DR805x Instructions set details
3.23.
LJMP
Instruction:
LCALL addr16
Function:
Long jump
Description:
LJMP causes an unconditional branch to the indicated address, by
loading the high- order and low-order bytes of the PC (respectively) with
the second and third instruction bytes. The destination may therefore be
anywhere in the full 64K program memory address space. No flags are
affected.
Operation:
(PC) ← addr15... addr0
Bytes:
Cycles:
3
4
Encoding:
0
0
0
All trademarks mentioned in this document
are trademarks of their respective owners.
0
0
0
address 15..8
address 7..0
1
0
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 48 -
DR805x Instructions set details
3.24.
MOV
Instruction:
MOV <dest-byte>, <src-byte>
Function:
Move byte variable
Description:
The byte variable indicated by the second operand is copied into the
location specified by the first operand. The source byte is not affected.
No other register or flag is affected. This is by far the most flexible
operation. Fifteen combinations of source and destination addressing
modes are allowed.
3.24.1.
MOV A, RN
Operation:
(PC) ← (PC) + 1
(A) ← (Rn)
Bytes:
Cycles:
1
1
Encoding:
1
3.24.2.
1
1
0
1
r
r
r
MOV A, DIRECT
Operation:
(PC) ← (PC) + 2
(A) ← (direct)
Note:
MOV A, ACC is a valid instruction.
Bytes:
Cycles:
2
2
Encoding:
1
1
1
All trademarks mentioned in this document
are trademarks of their respective owners.
0
0
1
0
1
direct address
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 49 -
DR805x Instructions set details
3.24.3.
MOV A, @RI
Operation:
(PC) ← (PC) + 1
(A) ← ((Ri))
Bytes:
Cycles:
1
2
Encoding:
1
3.24.4.
1
1
0
0
1
1
i
0
1
0
0
1
r
r
r
1
r
r
r
MOV A, #DATA
Operation:
(PC) ← (PC) + 2
(A) ← #data
Bytes:
Cycles:
2
2
Encoding:
0
3.24.5.
1
1
1
immediate data
MOV RN, A
Operation:
(PC) ← (PC) + 1
(Rn) ← (A)
Bytes:
Cycles:
1
2
Encoding:
1
3.24.6.
1
1
1
MOV RN, DIRECT
Operation:
(PC) ← (PC) + 2
(Rn) ← (direct)
Bytes:
Cycles:
2
4
Encoding:
1
0
1
All trademarks mentioned in this document
are trademarks of their respective owners.
0
direct address
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 50 -
DR805x Instructions set details
3.24.7.
MOV RN, #DATA
Operation:
(PC) ← (PC) + 2
(Rn) ← #data
Bytes:
Cycles:
2
2
Encoding:
0
3.24.8.
1
1
1
1
r
r
r
immediate data
0
1
direct address
r
r
direct address
MOV DIRECT, A
Operation:
(PC) ← (PC) + 2
(direct) ← (A)
Bytes:
Cycles:
2
2 – destination inside SFR
3 – destination inside RAM
Encoding:
1
3.24.9.
1
1
1
0
1
MOV DIRECT, RN
Operation:
(PC) ← (PC) + 2
(direct) ← (Rn)
Bytes:
Cycles:
2
2 – destination inside SFR
3 – destination inside RAM
Encoding:
1
3.24.10.
0
0
0
1
r
MOV DIRECT, DIRECT
Operation:
(PC) ← (PC) + 3
(direct) ← (direct)
Bytes:
Cycles:
3
3 – destination inside SFR
4 – destination inside RAM
Encoding:
1
0
0
0
0
1
0
1
direct address (source)
direct address (destination)
All trademarks mentioned in this document
are trademarks of their respective owners.
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 51 -
DR805x Instructions set details
3.24.11.
MOV DIRECT, @RI
Operation:
(PC) ← (PC) + 2
(direct) ← ((Ri))
Bytes:
Cycles:
2
3 – direct inside SFR
4 – direct inside RAM
Encoding:
1
3.24.12.
0
0
0
0
1
1
i
direct address
MOV DIRECT, #DATA
Operation:
(PC) ← (PC) + 2
(direct) ← #data
Bytes:
Cycles:
3
3
Encoding:
0
3.24.13.
1
1
1
0
1
0
direct address (source)
immediate data
1
MOV @RI, A
Operation:
(PC) ← (PC) + 1
((Ri)) ← (A)
Bytes:
Cycles:
1
3
Encoding:
1
3.24.14.
1
1
1
0
1
1
i
0
1
1
i
MOV @RI, DIRECT
Operation:
(PC) ← (PC) + 2
((Ri)) ← (direct)
Bytes:
Cycles:
2
4
Encoding:
1
0
1
All trademarks mentioned in this document
are trademarks of their respective owners.
0
direct address
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 52 -
DR805x Instructions set details
3.24.15.
MOV @RI, #DATA
Operation:
(PC) ← (PC) + 2
((Ri)) ← #data
Bytes:
Cycles:
2
3
Encoding:
0
3.24.16.
Function:
1
1
1
0
1
1
i
immediate data
MOV C, BIT
Move bit data
Description: The Boolean variable indicated by the second operand (directly
addressable bit) is copied into carry flag. No other register or flag is
affected.
Operation:
(PC) ← (PC) + 2
(C)
← (bit)
Bytes:
Cycles:
2
3
Encoding:
1
3.24.17.
Function:
0
1
0
0
0
1
0
bit address
MOV BIT, C
Move carry flag
Description: The carry flag is copied into the Boolean variable indicated by the first
operand (directly addressable bit). No other register or flag is affected.
Operation:
(PC) ← (PC) + 2
(bit) ← (C)
Bytes:
Cycles:
2
4
Encoding:
1
0
0
All trademarks mentioned in this document
are trademarks of their respective owners.
1
0
0
1
0
bit address
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 53 -
DR805x Instructions set details
3.24.18.
Function:
MOV DPTR, #DATA16
Load data pointer with a 16-bit constant
Description: The data pointer is loaded with the 16-bit constant indicated. The 16 bit
constant is loaded into the second and third bytes of the instruction. The
second byte (DPH) is the high-order byte, while the third byte (DPL)
holds the low-order byte. No flags are affected. This is the only
instruction which moves 16 bits of data at once.
Operation:
(PC) ← (PC) + 3
DPH ← immediate data15...8
DPL ← immediate data7..0
Bytes:
Cycles:
3
3
Encoding:
1
0
0
0
0
1
0
immediate data 15...8
immediate data 7...0
All trademarks mentioned in this document
are trademarks of their respective owners.
1
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 54 -
DR805x Instructions set details
3.25.
MOVC
Instruction:
MOVC A, @A + <base-reg>
Function:
Move code byte
Description:
The MOVC instructions load the accumulator with a code byte, or
constant from program memory. The address of the byte fetched is the
sum of the original unsigned eight-bit accumulator contents and the
contents of a sixteen-bit base register, which may be either the data
pointer or the PC. In the latter case, the PC is incremented to the
address of the following instruction before being added to the
accumulator; otherwise the base register is not altered. Sixteen-bit
addition is performed so a carry-out from the low-order eight bits may
propagate through higher-order bits. No flags are affected.
3.25.1.
MOVC A, @A + DPTR
Operation:
(PC) ← (PC) + 1
(A) ← ((A) + (DPTR))
Bytes:
Cycles:
1
4
Encoding:
1
3.25.2.
0
0
1
0
0
1
1
0
1
1
MOVC A, @A + PC
Operation:
(PC) ← (PC) + 1
(A) ← ((A) + (PC))
Bytes:
Cycles:
1
4
Encoding:
1
0
0
All trademarks mentioned in this document
are trademarks of their respective owners.
0
0
http://www.DigitalCoreDesign.com
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
- 55 -
DR805x Instructions set details
3.26.
MOVX
Instruction:
MOVX <dest-byte>, <src-byte>
Function:
Move external
Description:
The MOVX instructions transfer data between the accumulator and a
byte of external data memory, hence the X appended to MOV. There
are two types of instructions, differing in whether they provide an eightbit or sixteen-bit indirect address to the external data RAM.
In the first type, the contents of R0 or R1 in the current register bank
provide an eight-bit address, in the second type of MOVX instructions,
the data pointer generates a sixteen-bit address. Please refer to the
section “External Data Memory” of core specification for more
information.
3.26.1.
MOVX A, @RI
Operation:
(PC) ← (PC) + 1
(A) ← ((Ri))
Bytes:
Cycles:
1
3
Encoding:
1
3.26.2.
1
1
0
0
0
1
i
0
0
0
0
MOVX A, @DPTR
Operation:
(PC) ← (PC) + 1
(A) ← ((DPTR))
Bytes:
Cycles:
1
2
Encoding:
1
1
1
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DR805x Instructions set details
3.26.3.
MOVX @RI, A
Operation:
(PC) ← (PC) + 1
((Ri)) ← (A)
Bytes:
Cycles:
1
4
Encoding:
1
3.26.4.
1
1
1
0
0
1
i
0
0
0
MOVX @DPTR, A
Operation:
(PC)
← (PC) + 1
((DPTR)) ← (A)
Bytes:
Cycles:
1
3
Encoding:
1
1
1
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1
0
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- 57 -
DR805x Instructions set details
3.27.
MUL
Instruction:
MUL AB
Function:
Multiply
Description:
MUL AB multiplies the unsigned eight-bit integers in the accumulator
and register B. The low-order byte of the sixteen-bit product is left in the
accumulator, and the high-order byte in B. If the product is greater than
255 (0FF H) the overflow flag is set; otherwise it is cleared. The carry
flag is always cleared.
Operation:
(PC) ← (PC) + 1
(A) ← (A) x (B) – result’s bits 7..0
(B) ← (A) x (B) – result’s bits 15..8
Bytes:
Cycles:
1
4
Encoding:
1
0
1
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0
0
1
0
0
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- 58 -
DR805x Instructions set details
3.28.
NOP
Function:
No operation
Description:
Execution continues at the following instruction. Other than the PC, no
registers or flags are affected.
Operation:
(PC) ← (PC) + 1
Bytes:
Cycles:
1
1
Encoding:
0
0
0
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0
0
0
0
0
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- 59 -
DR805x Instructions set details
3.29.
ORL
Instruction:
ORL <dest-byte>, <src-byte>
Function:
Logical OR for byte variables
Description:
ORL performs the bit wise logical OR operation between the indicated
variables, storing the results in the destination byte. No flags are
affected (except P, if <dest-byte> = A).
The two operands allow six addressing mode combinations. When the
destination is the accumulator, the source can use register, direct,
register-indirect, or immediate addressing; when the destination is a
direct address, the source can be the accumulator or immediate data.
Note:
When this instruction is used to modify an output port, the value used
as the original port data will be read from the output data latch, not the
input pins.
3.29.1.
ORL A, RN
Operation:
(PC) ← (PC) + 1
(A) ← (A) or (Rn)
Bytes:
Cycles:
1
2
Encoding:
0
3.29.2.
1
0
0
1
r
r
r
1
0
1
ORL A, DIRECT
Operation:
(PC) ← (PC) + 2
(A) ← (A) or (direct)
Bytes:
Cycles:
2
3
Encoding:
0
1
0
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DR805x Instructions set details
3.29.3.
ORL A, @RI
Operation:
(PC) ← (PC) + 1
(A) ← (A) or ((Ri))
Bytes:
Cycles:
1
3
Encoding:
0
3.29.4.
1
0
0
0
1
1
i
1
0
0
immediate data
1
0
direct address
0
0
0
1
direct address
Immediate data
1
ORL A, #DATA
Operation:
(PC) ← (PC) + 1
(A) ← (A) or #data
Bytes:
Cycles:
2
2
Encoding:
0
3.29.5.
1
0
0
0
ORL DIRECT, A
Operation:
(PC) ← (PC) + 1
(direct) ← (direct) or (A)
Bytes:
Cycles:
2
4
Encoding:
0
3.29.6.
1
0
0
0
0
ORL DIRECT, #DATA
Operation:
(PC) ← (PC) + 1
(direct) ← (direct) or #data
Bytes:
Cycles:
3
4
Encoding:
0
Instruction:
1
0
ORL C, <src-bit>
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DR805x Instructions set details
Function:
Logical OR for bit variables
Description:
Set the carry flag if the Boolean value is a logic 1; leave the carry in its
current state otherwise. A slash (“/”) preceding the operand in the
assembly language indicates that the logical complement of the
addressed bit is used as the source value, but the source bit itself is not
affected. No other flags are affected.
3.29.7.
ORL C, BIT
Operation:
(PC) ← (PC) + 2
(C) ← (C) or (bit)
Bytes:
Cycles:
2
3
Encoding:
0
3.29.8.
1
1
1
0
0
1
0
0
0
0
0
bit address
ORL C, /BIT
Operation:
(PC) ← (PC) + 2
(C) ← (C) or /(bit)
Bytes:
Cycles:
2
3
Encoding:
1
0
1
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0
bit address
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- 62 -
DR805x Instructions set details
3.30.
POP
Instruction:
POP direct
Function:
Pop from stack
Description:
The contents of the internal RAM location addressed by the stack
pointer are read, and the stack pointer is decremented by one. The
value read is the transfer to the directly addressed byte indicated. No
flags are affected.
Operation:
(PC) ← (PC) + 2
(direct) ← ((SP))
(SP)
← (SP) - 1
Bytes:
Cycles:
2
2 – direct inside SFR
3 – direct inside RAM
Encoding:
1
1
0
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0
0
0
0
direct address
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- 63 -
DR805x Instructions set details
3.31.
PUSH
Instruction:
PUSH direct
Function:
Push onto stack
Description:
The stack pointer is incremented by one. The contents of the indicated
variable are then copied into the internal RAM location addressed by
the stack pointer. Otherwise no flags are affected.
Operation:
(PC) ← (PC) + 2
(SP) ← (SP) + 1
((SP)) ← (direct)
Bytes:
Cycles:
2
4
Encoding:
1
1
0
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0
0
0
0
0
direct address
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- 64 -
DR805x Instructions set details
3.32.
RET
Function:
Return from subroutine
Description:
RET pops the high and low-order bytes of the PC successively from the
stack, decrementing the stack pointer by two. Program execution
continues at the resulting address, generally the instruction immediately
following an ACALL or LCALL. No flags are affected.
Operation:
(PC15-8)
(SP)
(PC7-0)
(SP)
Bytes:
Cycles:
1
4
← ((SP))
← (SP) - 1
← ((SP))
← (SP) - 1
Encoding:
0
0
1
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0
0
0
1
0
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- 65 -
DR805x Instructions set details
3.33.
RETI
Function:
Return from interrupt
Description:
RETI pops the high and low-order bytes of the PC successively from
the stack, and restores the interrupt logic to accept additional interrupts
at the same priority level as the one just processed. The stack pointer is
left decremented by two. No other registers are affected; the PSW is not
automatically restored to its pre-interrupt status. Program execution
continues at the resulting address, which is generally the instruction
immediately after the point at which the interrupt request was detected.
If a lower or same-level interrupt is pending when the RETI instruction is
executed, that one instruction will be executed before the pending
interrupt is processed.
Operation:
(PC15-8)
(SP)
(PC7-0)
(SP)
Bytes:
Cycles:
1
4
← ((SP))
← (SP) - 1
← ((SP))
← (SP) - 1
Encoding:
0
0
1
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1
0
0
1
0
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- 66 -
DR805x Instructions set details
3.34.
RL
Instruction:
RL A
Function:
Rotate accumulator left
Description:
The eight bits in the accumulator are rotated one bit to the left. Bit 7 is
rotated into the bit 0 position. No flags are affected.
Operation:
(PC)
← (PC) + 1
(An + 1) ← (An) n = 0-6
(A0)
← (A7)
Bytes:
Cycles:
1
1
Encoding:
0
0
1
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0
0
0
1
1
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- 67 -
DR805x Instructions set details
3.35.
RLC
Instruction:
RLC A
Function:
Rotate accumulator left through carry flag
Description:
The eight bits in the accumulator and the carry flag are together rotated
one bit to the left. Bit 7 moves into the carry flag; the original state of the
carry flag moves into the bit 0 position. No other flags are affected.
Operation:
(PC)
(An + 1)
(A0)
(C)
Bytes:
Cycles:
1
1
← (PC) + 1
← (An) n = 0-6
← (C)
← (A7)
Encoding:
0
0
1
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1
0
0
1
1
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- 68 -
DR805x Instructions set details
3.36.
RR
Instruction:
RR A
Function:
Rotate accumulator right
Description:
The eight bits in the accumulator are rotated one bit to the right. Bit 0 is
rotated into the bit 7 position. No flags are affected.
Operation:
(PC) ← (PC) + 1
(An) ← (An + 1) n = 0-6
(A7) ← (A0)
Bytes:
Cycles:
1
1
Encoding:
0
0
0
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0
0
0
1
1
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- 69 -
DR805x Instructions set details
3.37.
RRC
Instruction:
RRC A
Function:
Rotate accumulator right through carry flag
Description:
The eight bits in the accumulator and the carry flag are together rotated
one bit to the right. Bit 0 moves into the carry flag; the original value of
the carry flag moves into the bit 7 position. No other flags are affected.
Operation:
(PC)
(An)
(A7)
(C)
Bytes:
Cycles:
1
1
← (PC) + 1
← (An + 1) n=0-6
← (C)
← (A0)
Encoding:
0
0
0
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1
0
0
1
1
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- 70 -
DR805x Instructions set details
3.38.
SETB
Instruction:
SETB <bit>
Function:
Set bit
Description:
SETB sets the indicated bit to one. SETB can operate on the carry flag
or any directly addressable bit. No other flags are affected.
3.38.1.
SETB C
Operation:
(PC) ← (PC) + 1
(C) ← 1
Bytes:
Cycles:
1
1
Encoding:
1
3.38.2.
1
0
1
0
0
1
1
0
0
1
0
SETB BIT
Operation:
(PC) ← (PC) + 2
(bit) ← 1
Bytes:
Cycles:
2
4
Encoding:
1
1
0
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bit address
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DR805x Instructions set details
3.39.
SJMP
Instruction:
SJMP rel
Function:
Short jump
Description:
Program control branches unconditionally to the address indicated. The
branch destination is computed by adding the signed displacement in
the second instruction byte to the PC, after incrementing the PC twice.
Therefore, the range of destinations allowed is from 128 bytes
preceding this instruction to 127 bytes following it.
Note:
Under the above conditions the instruction following SJMP will be at
102 H. Therefore, the displacement byte of the instruction will be the
relative offset (0123 H - 0102 H ) = 21 H . In other words, an SJMP with
a displacement of 0FE H would be a one-instruction infinite loop.
Operation:
(PC) ← (PC) + 2
(PC) ← (PC) + rel
Bytes:
Cycles:
2
3
Encoding:
1
0
0
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0
0
0
0
relative address
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- 72 -
DR805x Instructions set details
3.40.
SUBB
Instruction:
SUBB A, <src-byte>
Function:
Subtract with borrow
Description:
SUBB subtracts the indicated variable and the carry flag together from
the accumulator, leaving the result in the accumulator. SUBB sets the
carry (borrow) flag if a borrow is needed for bit 7, and clears C
otherwise. (If C was set before executing a SUBB instruction, this
indicates that a borrow was needed for the previous step in a multiple
precision subtraction, so the carry is subtracted from the accumulator
along with the source operand). AC is set if a borrow is needed for bit 3,
and cleared otherwise. OV is set if a borrow is needed into bit 6 but not
into bit 7, or into bit 7 but not bit 6.
When subtracting signed integers OV indicates a negative number
produced when a negative value is subtracted from a positive value, or
a positive result when a positive number is subtracted from a negative
number.
The source operand allows four addressing modes: register, direct,
register-indirect, or immediate.
3.40.1.
SUBB A, RN
Operation:
(PC) ← (PC) + 1
(A) ← (A) - (C) - (Rn)
Bytes:
Cycles:
1
2
Encoding:
1
3.40.2.
0
0
1
1
r
r
r
0
1
SUBB A, DIRECT
Operation:
(PC) ← (PC) + 2
(A) ← (A) - (C) - (direct)
Bytes:
Cycles:
2
3
Encoding:
1
0
0
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0
1
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DR805x Instructions set details
3.40.3.
SUBB A, @RI
Operation:
(PC) ← (PC) + 1
(A) ← (A) - (C) - ((Ri))
Bytes:
Cycles:
1
3
Encoding:
1
3.40.4.
0
0
1
0
1
1
i
1
0
0
SUBB A, #DATA
Operation:
(PC) ← (PC) + 2
(A) ← (A) - (C) - #data
Bytes:
Cycles:
2
2
Encoding:
1
0
0
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1
0
immediate data
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DR805x Instructions set details
3.41.
SWAP
Instruction:
SWAP A
Function:
Swap nibbles within the accumulator
Description:
SWAP A interchanges the low and high-order nibbles (four-bit fields) of
the accumulator (bits 3-0 and bits 7-4). The operation can also be
thought of as a four-bit rotate instruction. No flags are affected.
Operation:
(PC) ← (PC) + 1
(A3-0) ↔ (A7-4),
(A7-4) ↔ (A3-0)
Bytes:
Cycles:
1
1
Encoding:
1
1
0
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0
0
1
0
0
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- 75 -
DR805x Instructions set details
3.42.
XCH
Instruction:
XCH A, <byte>
Function:
Exchange accumulator with byte variable
Description:
XCH loads the accumulator with the contents of the indicated variable,
at the same time writing the original accumulator contents to the
indicated variable. The source/destination operand can use register,
direct, or register-indirect addressing.
3.42.1.
XCH A, RN
Operation:
(PC) ← (PC) + 1
(A) ↔ (Rn)
Bytes:
Cycles:
1
2
Encoding:
1
3.42.2.
1
0
0
1
r
r
r
0
1
0
1
0
1
1
i
XCH A, DIRECT
Operation:
(PC) ← (PC) + 2
(A) ↔ (direct)
Bytes:
Cycles:
2
3
Encoding:
1
3.42.3.
1
0
0
direct address
XCH A, @RI
Operation:
(PC) ← (PC) + 1
(A) ↔ ((Ri))
Bytes:
Cycles:
1
3
Encoding:
1
1
0
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- 76 -
DR805x Instructions set details
3.43.
XCHD
Instruction:
XCHD A, @Ri
Function:
Exchange digit
Description:
XCHD exchanges the low-order nibble of the accumulator (bits 3-0,
generally representing a hexadecimal or BCD digit), with that of the
internal RAM location indirectly addressed by the specified register. The
high-order nibbles (bits 7-4) of each register are not affected. No flags
are affected.
Operation:
(PC) ← (PC) + 1
(A3-0) ↔ ((Ri)3-0)
Bytes:
Cycles:
1
3
Encoding:
1
1
0
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1
0
1
1
i
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- 77 -
DR805x Instructions set details
3.44.
XRL
Instruction:
XRL <dest-byte>, <src-byte>
Function:
Logical Exclusive OR for byte variables
Description:
XRL performs the bit wise logical Exclusive OR operation between the
indicated variables, storing the results in the destination. No flags are
affected (except P, if <dest-byte> = A).
The two operands allow six addressing mode combinations. When the
destination is the accumulator, the source can use register, direct,
register-indirect, or immediate addressing; when the destination is a
direct address, the source can be accumulator or immediate data.
Note:
When this instruction is used to modify an output port, the value used
as the original port data will be read from the output data latch, not the
input pins.
3.44.1.
XRL A, RN
Operation:
(PC) ← (PC) + 1
(A) ← (A) xor (Rn)
Bytes:
Cycles:
1
2
Encoding:
0
3.44.2.
1
1
0
1
r
r
r
1
0
1
XRL A, DIRECT
Operation:
(PC) ← (PC) + 2
(A) ← (A) xor (direct)
Bytes:
Cycles:
2
3
Encoding:
0
1
1
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- 78 -
DR805x Instructions set details
3.44.3.
XRL A, @ RI
Operation:
(PC) ← (PC) + 1
(A) ← (A) xor ((Ri))
Bytes:
Cycles:
1
3
Encoding:
0
3.44.4.
1
1
0
0
1
1
i
1
0
0
immediate data
1
0
direct address
XRL A, #DATA
Operation:
(PC) ← (PC) + 2
(A) ← (A) xor #data
Bytes:
Cycles:
2
2
Encoding:
0
3.44.5.
1
1
0
0
XRL DIRECT, A
Operation:
(PC) ← (PC) + 2
(direct) ← (direct) xor (A)
Bytes:
Cycles:
2
4
Encoding:
0
3.44.6.
1
1
0
0
0
XRL DIRECT, #DATA
Operation:
(PC)
(direct)
Bytes:
Cycles:
3
4
← (PC) + 3
← (direct) xor #data
Encoding:
0
1
1
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0
0
0
1
direct address
immediate data
1
http://www.DigitalCoreDesign.com
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Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
DR805x Instructions set details
- 79 -
4. CONTACTS
If any problems are encountered please contact Digital Core Design.
Headquarters:
Wroclawska 94
41-902 Bytom
POLAND
e-mail: iinnffoo@
@ddccdd..ppll
tel.
: +48 32 282 82 66
fax
: +48 32 282 74 37
Field Office:
Texas Research Park
14815 Omicron Dr. suite 100
San Antonio, TX 78245,USA
e-mail: iinnffooU
USS@
@ddccdd..ppll
tel.
: +1 210 422 8268
fax
: +1 210 679 7511
Distributors:
Please check hhttttpp::////w
ww
ww
w..ddccdd..ppll//aappaarrttnn..pphhpp
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Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.