Document Title: [2650.txt (text file)]
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| Signetics |
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| 2650 MICROPROCESSOR Instruction Set Summary |
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| _________ _________ |
| _| \__/ |_ |
| --> SENSE |_|1 40|_| FLAG --> |
| _| |_ |
| <-- A12 |_|2 39|_| Vcc |
| _| |_ |
| <-- A11 |_|3 38|_| CLOCK <-- |
| _| |_ _____ |
| <-- A10 |_|4 37|_| PAUSE <-- |
| _| |_ _____ |
| <-- A9 |_|5 36|_| OPACK <-- |
| _| |_ ____ |
| <-- A8 |_|6 35|_| RUN/WAIT --> |
| _| |_ |
| <-- A7 |_|7 34|_| INTACK --> |
| _| |_ |
| <-- A6 |_|8 33|_| D0 <--> |
| _| |_ |
| <-- A5 |_|9 32|_| D1 <--> |
| _| |_ |
| <-- A4 |_|10 2650A 31|_| D2 <--> |
| _| |_ |
| <-- A3 |_|11 30|_| D3 <--> |
| _| |_ |
| <-- A2 |_|12 29|_| D4 <--> |
| _| |_ |
| <-- A1 |_|13 28|_| D5 <--> |
| _| |_ |
| <-- A0 |_|14 27|_| D6 <--> |
| _____ _| |_ |
| --> ADREN |_|15 26|_| D7 <--> |
| _| |_ ______ |
| --> RESET |_|16 25|_| DBUSEN <-- |
| ______ _| |_ |
| --> INTREQ |_|17 24|_| OPREQ --> |
| _ _| |_ _ |
| <-- A14-D/C |_|18 23|_| R/W --> |
| __ _| |_ |
| <-- A13-E/NE |_|19 22|_| WRP --> |
| __ _| |_ |
| <-- M/IO |_|20 21|_| GND |
| |______________________| |
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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 March 1982 |
|Updated April 1985 |
|Issue 1.1 Copyright (C) J.P.Bowen 1985|
----------------------------------------------------------------
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|Mnemonic|Op|cIOC|~|Description |Notes |
|--------+--+----+-+------------------------------+------------|
|ADDA,r a|8C|****|4|Add Absolute |r=r+a |
|ADDI,r i|84|****|2|Add Immediate |r=r+i |
|ADDR,r l|88|****|3|Add Relative |r=r+l |
|ADDZ,r |80|****|2|Add to register Zero |R0=R0+r |
|ANDA,r a|4C|*---|4|Logical AND Absolute |r=r&a |
|ANDI,r i|44|*---|2|Logical AND Immediate |r=r&i |
|ANDR,r l|48|*---|3|Logical AND Relative |r=r&l |
|ANDZ,r |40|*---|2|Logical AND register Zero |R0=R0&r |
|BCFA,d b|9C|----|3|Branch on Cond. False Absolute|If d#c, PC=b|
|BCFR,d l|98|----|3|Branch on Cond. False Relative|If d#c, PC=l|
|BCTA,d b|1C|----|3|Branch on Cond. True Absolute |If d=c, PC=b|
|BCTR,d l|18|----|3|Branch on Cond. True Relative |If d=c, PC=l|
|BDRA,r b|FC|----|3|Branch on Dec. Reg. Absolute |r=r-1,if r#0|
|BDRR,r l|F8|----|3|Branch on Dec. Reg. Relative |r=r-1,if r#0|
|BIRA,r b|DC|----|3|Branch on Inc. Reg. Absolute |r=r+1,if r#0|
|BIRR,r l|D8|----|3|Branch on Inc. Reg. Relative |r=r+1,if r#0|
|BRNA,r b|5C|----|3|Branch on Reg. Non-zero Abs. |If r#0, PC=b|
|BRNR,r l|58|----|3|Branch on Reg. Non-zero Rel. |If r#0, PC=l|
|BSFA,d b|BC|----|3|Branch to Sub. on False Abs. |If d#c,calla|
|BSFR,d l|B8|----|3|Branch to Sub. on False Rel. |If d#c,callr|
|BSNA,r b|7C|----|3|Branch to Sub. on Non-zero Abs|If d#c,calla|
|BSNR,r l|78|----|3|Branch to Sub. on Non-zero Rel|If d#c,callr|
|BSTA,d b|3C|----|3|Branch to Sub. on True Abs. |If d=c,calla|
|BSTR,d l|38|----|3|Branch to Sub. on True Rel. |If d=c,callr|
|BSXA b|BF|----|3|Branch to Sub. Extended Addr. |calla |
|BXA b|9F|----|3|Branch to Extended Address |PC=b |
|COMA,r a|EC|*---|4|Compare Absolute |r-a |
|COMI,r i|E4|*---|2|Compare Immediate |r-i |
|COMR,r l|E8|*---|3|Compare Relative |r-l |
|COMZ,r |E0|*---|2|Compare with register Zero |R0-r |
|CPSL i|75|----|3|Clear Program Status Lower |If i=1,PSL=0|
|CPSU i|74|----|3|Clear Program Status Upper |PSU=PSU&(~i)|
|DAR,r |94|----|3|Decimal Adjust Register |r=BCD format|
|EORA,r a|2C|*---|4|Logical Exclusive OR Absolute |r=rxa |
|EORI,r i|24|*---|2|Logical Exclusive OR Immediate|r=rxi |
|EORR,r l|28|*---|3|Logical Exclusive OR Relative |r=rxl |
|EORZ,r |20|*---|2|Logical Exclusive OR reg Zero |R0=R0xr |
|HALT |40|----|2|Halt |Wait state |
|IORA,r a|6C|*---|4|Logical Inclusive OR Absolute |r=rva |
|IORI,r i|64|*---|2|Logical Inclusive OR Immediate|r=rvi |
|IORR,r l|68|*---|3|Logical Inclusive OR Relative |r=rvl |
|IORZ,r |60|*---|2|Logical Inclusive OR reg Zero |R0=R0vr |
|LODA,r a|0C|*---|4|Load Absolute |r=a |
|LODI,r i|04|*---|2|Load Immediate |r=i |
|LODR,r l|08|*---|3|Load Relative |r=l |
|LODZ,r |00|*---|2|Load register Zero |R0=r |
|LPSL |93|----|2|Load Program Status Lower |PSL=R0 |
|LPSU |92|----|2|Load Program Status Upper |PSU=R0 |
|NOP |C0|----|2|No Operation | |
|PPSL i|77|----|3|Preset Program Status Lower |If i=1,PSL=1|
|PPSU i|76|----|3|Preset Program Status Upper |If i=1,PSU=1|
|REDC,r |30|*---|2|Read Control |r=statusNE |
|REDD,r |70|*---|2|Read Data |r=dataNE |
|REDE,r p|54|*---|3|Read Extended |r=p |
|RETC,d |14|----|3|Return on Condition |If d=c,ret |
|RETE,d |34|----|3|Return cond, Enable interrupts|ret,II=0 |
|RRL,r |D0|----|2|Rotate Register Left |r=->{rr} |
|RRR,r |50|----|2|Rotate Register Right |r={rr}<- |
|SPSL |13|----|2|Store Program Status Lower |R0=PSL |
|SPSU |12|----|2|Store Program Status Upper |R0=PSU |
|STRA,r a|CC|----|4|Store Absolute |a=r |
|STRR,r l|C8|----|3|Store Relative |l=r |
|STRZ,r |C0|----|2|Store register Zero |r=R0 |
|SUBA,r a|AC|****|4|Subtract Absolute |r=r-a |
|SUBI,r i|A4|****|2|Subtract Immediate |r=r-i |
|SUBR,r l|A8|****|3|Subtract Relative |r=r-l |
|SUBZ,r |A0|****|2|Subtract from register Zero |R0=R0-r |
|TMI,r i|F4|*---|3|Test under Mask Immediate |r&i |
|TPSL,r i|B5|*---|3|Test Program Status Lower |i-PSL |
|TPSU,r i|B4|*---|3|Test Program Status Upper |i-PSU |
|WRTC,r |B0|----|2|Write Control |statusNE=r |
|WRTD,r |F0|----|2|Write Data |dataNE=r |
|WRTE,r p|D4|----|3|Write Extended |p=r |
|ZBRR l|9B|----|3|Zero page Branch |PC=l |
|ZBSR l|BB|----|3|Zero page Branch to Subroutine|callr |
| |XX| |X|8-bit opcode, machine cycles |Hexadecimal |
----------------------------------------------------------------
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|Mnemonic |cIOC|Description |
|-----------+----+---------------------------------------------|
| |- |Unaffected |
| |* |Affected |
| |0 |Reset |
| |1 |Set |
| |? |Unknown |
|-----------+----+---------------------------------------------|
| S | |Sense (PSU bit 7) |
| F | |Flag (PSU bit 6) |
| II | |Interrupt Inhibit (PSU bit 5) |
| SP2 | |Stack Pointer two (PSU bit 2) |
| SP1 | |Stack Pointer one (PSU bit 1) |
| SP0 | |Stack Pointer zero (PSU bit 0) |
|-----------+----+---------------------------------------------|
| CC1 |c |Condition Code one (PSL bit 7) |
| CC0 |c |Condition Code zero (PSL bit 6) |
| IDC | I |Inter-Digit Carry status (PSL bit 5) |
| RS | |Register bank Select (R1-R3, PSL bit 4) |
| WC | |With/without Carry (PSL bit 3) |
| OVF | O |Overflow status (PSL bit 2) |
| COM | |Logical/arithmetic Compare (PSL bit 1) |
| C | C|Carry/borrow status (PSL bit 0) |
|----------------+---------------------------------------------|
| a |16-bit extended address |
| b |16-bit absolute address |
| c |2-bit condition codes CC1 and CC0 |
| calla |[SP]+=PC+3,PC=b |
| callr |[SP]+=PC+2,PC=l |
| d |2-bit immediate data unit |
| dataNE |Non-extended data port |
| i |8-bit immediate data unit |
| l |8-bit relative address |
| p |8-bit I/O port number |
| r |Register Rn (n=0-3) |
| ret |If r#0, PC=[SP]- |
| statusNE |Non-extended status port |
|----------------+---------------------------------------------|
| PC |Program Counter |
| PSL |Program Status Lower (8-bit) |
| PSU |Program Status Upper (8-bit) |
| R0 |Register zero - accumulator |
| Rn |Register (n=0-3) |
| SP |Stack pointer |
|----------------+---------------------------------------------|
| + |Arithmetic addition |
| - |Arithmetic subtraction |
| * |Arithmetic multiplication |
| / |Arithmetic division |
| & |Logical AND |
| ~ |Logical NOT |
| v |Logical inclusive OR |
| x |Logical exclusive OR |
| = |Equal or assignment |
| # |Not equal |
| <- |Rotate left |
| -> |Rotate right |
| [ ] |Indirect addressing |
| [ ]+ |Indirect addressing, auto-increment |
| -[ ] |Auto-decrement, indirect addressing |
| { } |Combination of operands |
| {rr} |If WC=1 then {C,r} else {r} |
| --> |Input pin |
| <-- |Output pin |
| <--> |Input/output pin |
|--------------------------------------------------------------|
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----------------------------------------------------------------
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