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from: ftp://ftp.comlab.ox.ac.uk/pub/Cards/
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| 6501/2/3/4/5 MICROPROCESSOR Instruction Set Summary |
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| M M OOOOO SSSSS |
| MM MM O O S S |
| M M M M O O S |
| M M M O O SSSSS |
| M M O O S |
| M M O O S S |
| M M OOOOO SSSSS |
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|Written by Jonathan Bowen |
| Programming Research Group |
| Oxford University Computing Laboratory |
| 8-11 Keble Road |
| Oxford OX1 3QD |
| England |
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| Tel +44-865-273840 |
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|Created September 1981 |
|Updated April 1985 |
|Issue 1.3 Copyright (C) J.P.Bowen 1985|
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|Mnem.|Op|NVBDIZC|A#ZBIRX@|~|Description |Notes |
|-----+--+-------+--------+-+----------------------+-----------|
|ADC s|6D|**---**| XxX X |4|Add with Carry |A=A+s+C %|
|AND s|2D|*----*-| XxX X |4|Logical AND |A=A&s %|
|ASL d|0E|*----**| xx |6|Arithmetic Shift Left |d={C,d,0}<-|
|ASLA |0A|*----**|X |2|Arithmetic Shift Left |A={C,d,0}<-|
|BCC a|90|-------| X |2|Branch if Carry Clear |If C=0(4~)%|
|BCS a|B0|-------| X |2|Branch if Carry Set |If C=1(4~)%|
|BEQ a|F0|-------| X |2|Branch if Equal |If Z=1(4~)%|
|BIT s|2C|**---*-| ** |4|Bit Test |A&s |
|BMI a|30|-------| X |2|Branch if Minus |If N=1(4~)%|
|BNE a|D0|-------| X |2|Branch if Not Equal |If Z=0(4~)%|
|BPL a|10|-------| X |2|Branch if Plus |If N=0(4~)%|
|BRK |00|--+-1--| X |7|Break (-[S]={PC+2,P})|PC=[FFFEH] |
|BVC a|50|-------| X |2|Branch if Overflow Clr|If V=0(4~)%|
|BVS a|70|-------| X |2|Branch if Overflow Set|If V=1(4~)%|
|CLC |18|------0| X |2|Clear Carry flag |C=0 |
|CLD |D8|---0---| X |2|Clear Decimal mode |D=0 |
|CLI |58|----0--| X |2|Clear Int. disable |I=0 |
|CLV |B8|-0-----| X |2|Clear Overflow flag |V=0 |
|CMP s|CD|*----**| XxX X |4|Compare |A-s |
|CPX s|EC|*----**| X** |4|Compare index register|X-s |
|CPY s|CC|*----**| X** |4|Compare index register|Y-s |
|DEC d|CE|*----*-| xx |6|Decrement |d=d-1 |
|DEX |CA|*----*-| X |2|Decrement index reg. |X=X-1 |
|DEY |88|*----*-| X |2|Decrement index reg. |Y=Y-1 |
|EOR s|4D|*----*-| XxX X |4|Logical Exclusive OR |A=Axs %|
|INC d|EE|*----*-| xx |6|Increment |d=d+1 |
|INX |E8|*----*-| X |2|Increment index reg. |X=X+1 |
|INY |C8|*----*-| X |2|Increment index reg. |Y=Y+1 |
|JMP s|4C|-------| * X|3|Jump | !|
|JSR s|20|-------| * |6|Jump to Subroutine |-[S]=PC+2,!|
|LDA s|AD|*----*-| XxX X |4|Load Accumulator |A=s %|
|LDX s|AE|*----*-| Xyy |4|Load index register |X=s %|
|LDY s|AC|*----*-| Xxx |4|Load index register |Y=s %|
|LSR d|4E|0----**| xx |6|Logical Shift Right |d=->{0,d,C}|
|LSRA |4A|0----**|X |2|Logical Shift Right |A=->{0,A,C}|
|NOP |EA|-------| X |2|No Operation | |
|ORA s|0D|*----*-| XxX X |4|Logical Inclusive OR |A=Avs |
|PHA |48|-------| X |3|Push Accumulator |-[S]=A |
|PHP |08|-------| X |3|Push status register |-[S]=P |
|PLA |68|-------| X |4|Pull Accumulator |A=[S]+ |
|PLP |28|*******| X |4|Pull Status Register |P=[S]+ |
|ROL d|2E|*----**| xx |6|Rotate Left |d={C,d}<- |
|ROLA |2A|*----**|X |2|Rotate Left Acc. |A={C,A}<- |
|ROR d|6E|*----**| xx |6|Rotate Right |d=->{C,d} |
|RORA |6A|*----**|X |2|Rotate Right Acc. |A=->{C,A} |
|RTI |40|*******| X |6|Return from Interrupt |{PC,P}=[S]+|
|RTS |60|-------| X |6|Return from Subroutine|PC={[S]+}+1|
|SBC s|ED|*----**| XxX X |4|Subtract with Carry |A=A-s-C %|
|SEC |38|------1| X |2|Set Carry flag |C=1 |
|SED |F8|---1---| X |2|Set Decimal mode |D=1 |
|SEI |78|----1--| X |2|Set Interrupt disable |I=1 |
|STA d|8D|-------| xX X |4|Store Accumulator |d=A |
|STX d|8E|-------| y* |4|Store index register |d=X |
|STY d|8C|-------| x* |4|Store index register |d=Y |
|TAX |AA|*----*-| X |2|Transfer Accumulator |X=A |
|TAY |A8|*----*-| X |2|Transfer Accumulator |Y=A |
|TSX |BA|*----*-| X |2|Transfer Stack Pointer|X=S |
|TXA |8A|*----*-| X |2|Transfer Index Reg. |A=X |
|TXS |9A|-------| X |2|Transfer Index Reg. |S=X |
|TYA |98|*----*-| X |2|Transfer Index Reg. |A=Y |
|-----+--+-------+--------+-+----------------------------------|
| |XX| | |X|Hexadecimal opcode/no. of cycles |
|--------+-------+--------+-+----------------------------------|
| |- | | |Flag unaffected |
| |* | | |Flag affected |
| |0 | | |Flag reset |
| |1 | | |Flag set |
| |+ | | |Flag set on stack |
|--------+-------+--------+-+----------------------------------|
| N |N | | |Negative status (Bit 7) |
| V | V | | |Overflow status (Bit 6) |
| B | B | | |Break command indicator (Bit 4) |
| D | D | | |Decimal mode control (Bit 3) |
| I | I | | |Interrupt disable control (Bit 2) |
| Z | Z | | |Zero status (Bit 1) |
| C | C| | |Carry status (Bit 0) |
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|Mnemonic |A#ZBIRX@|Description |Opcode| ~s |
|----------------+--------+------------------------+------+----|
| |X |All mode(s) valid | | |
| |* |Non-indexed mode valid | | |
| |x |X/non-indexed mode valid| | |
| |y |Y/non-indexed mode valid| | |
|----------------+--------+------------------------+------+----|
| | |Add XXH to opcode | +XXH | |
| | |Subtract XXH from opcode| -XXH | |
| | |Add X to no. of cycles | | +X |
| | |Subtract X from cycles | | -X |
|----------------+--------+------------------------+------+----|
| A |A |Accumulator | | |
| #n | # |Immediate | -04H | -2 |
| <n | * |Zero page | -08H | -1 |
| n | * |Zero page (DIRECT mode) | -08H | -1 |
| n,X | x |Zero page indexed (X) | +08H | +0 |
| n,Y | y |Zero Page indexed (Y) | +08H | +0 |
| >nn | * |Absolute | +00H | +0 |
| nn | * |Absolute (EXTEND mode) | +00H | +0 |
| nn,X | x |Absolute indexed (X) | +10H | +0 |
| nn,Y | y |Absolute indexed (Y) | +0CH | +0 |
| LDX nn,Y | y | ditto | +10H | +0 |
| | I |Implicit | | |
| a | R |Relative(PC=PC+1+offset)| | +2 |
| [nn,X] | x |Indexed indirect (X) | -0CH | +2 |
| [nn],Y | y |Indirect indexed (Y) | +04H | +1 |
| [nn] | @|Absolute indirect | +20H | +2 |
|-------------------------+------------------------------------|
|BYTE n(,...) |Byte(s) (8-bit) |
|BYTE 'string'(,...) |Byte text string(s) |
|DIRECT |Zero page addressing mode |
|EXTEND |Absolute addressing mode |
|RMB nn(,...) |Reserve Memory Bytes |
|WORD nn(,...) |Word(s) (16-bit) |
|-------------------------+------------------------------------|
| A |Accumulator (8-bit) |
| P |Status Register (8-bit) |
| PC |Program Counter (16-bit) |
| S |Stack Pointer (9-bit, MSB=1) |
| X Y |Index Registers X and Y (8-bit) |
|-------------------------+------------------------------------|
| a |Relative Address (-128 to +127) |
| d |Destination |
| n |8-bit expression (0 to 255) |
| nn |16-bit expression (0 to 65535) |
| s |Source |
| string |String of ASCII characters |
|-------------------------+------------------------------------|
| + |Arithmetic addition |
| - |Arithmetic subtraction |
| * |Arithmetic multiplication |
| / |Arithmetic division |
| & |Logical AND |
| ~ |Logical NOT |
| v |Logical inclusive OR |
| x |Logical exclusive OR |
| <- |Rotate left |
| -> |Rotate right |
| [ ] |Indirect addressing |
| [ ]+ |Indirect addressing, auto-increment |
| -[ ] |Auto-decrement, indirect addressing |
| { } |Combination of operands |
| $ |Program counter content |
| % |~s = ~s+1 if crossing page boundary |
| ! |PC = effective address of source |
|-------------------------+------------------------------------|
|0000H to 00FFH |Page 0 (see zero page addressing) |
|0100H to 01FFH |Page 1 (stack area, 01FFH = start) |
|XX00H to XXFFH |Page n (where n=XXH) |
|FFFAH to FFFBH |Non maskable interrupt (NMI) vector |
|FFFCH to FFFDH |Reset (RES) vector |
|FFFEH to FFFFH |Interrupt Request (IRQ) vector |
|FFFEH to FFFFH |Break command vector (see BRK) |
|-------------------------+------------------------------------|
| 6501/6502 |16 address lines, 65536 bytes max. |
| 6503/6505 |13 address lines, 8192 bytes max. |
| 6504 |12 address lines, 4096 bytes max. |
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