PDSP1601 MC
Table 1 ALU instructions
1a. ARITHMETIC INSTRUCTIONS
Inst
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
IA4-IA0 Mnemonic
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
CLRXX
MIAX1
MIACI
MIACO
A2SGN
A2RAL
A2RAR
A2RSX
APBCI
APBCO
AMBX1
AMBCI
AMBCO
BMAX1
BMACI
BMACO
Operation
RESET
MINUS A
MINUS A
MINUS A
A/2
A/2
A/2
A/2
A PLUS B
A PLUS B
A MINUS B
A MINUS B
A MINUS B
B MINUS A
B MINUS A
B MINUS A
Function
CLEAR ALL REGISTERS
NA Plus 1
NA Plus CI
NA Plus CO
A/2 Sign Extend
A/2 with Ral LSB
A/2 with RAR LSB
A/2 with RSX LSB
A Plus B Plus CI
A Plus B Plus CO
A Plus NB Plus 1
A Plus NB Plus CI
A Plus NB Plus CO
NA Plus B Plus 1
NA Plus B Plus CI
NA Plus B Plus CO
Mode
---------
LSBYTE
CASCADE
MULTICYCLE
MSBYTE
MULTICYCLE
MULTICYCLE
MULTICYCLE
CASCADE
MULTICYCLE
LSBYTE
CASCADE
MULTICYCLE
LSBYTE
CASCADE
MULTICYCLE
1b. LOGICAL INSTRUCTIONS
Inst
10
11
12
13
14
15
16
17
IA4-AI0 Mnemonic
10000
10001
10010
10011
10100
10101
10110
10111
ANXAB
ANANB
ANNAB
ORXAB
ORNAB
XORAB
PASXA
PASNA
Operation
A AND B
A AND NB
NA AND B
A OR B
NA OR B
A XOR B
PASS A
INVERT A
Function
A. B
A. NB
NA. B
A+B
NA + B
A XOR B
A
NA
1c. CONTROL INSTRUCTIONS
Inst
18
19
1A
1B
1C
1D
1E
1F
IA4-AI0 Mnemonic
11000
11001
11010
11011
11100
11101
11110
11111
SBFOV
SBFU1
SBFU2
SBFZE
OPONE
OPBYT
OPNIB
OPALT
Operation
Set BFP Flag to OVR, Force ALU output to zero
Set BFP Flag to UND 1 Force ALU output to zero
Set BFP Flag to UND 2 Force ALU output to zero
Set BFP Flag to ZERO Force ALU output to zero
Output 0001 Hex
Output 00FF Hex
Output 000F Hex
Output 5555 Hex
KEY
A
B
CI
CO
RAL
RAR
RSX
MNEMONICS
= A input to ALU
= B input to ALU
= External Carry in to ALU
= Internally Registered Carry out from ALU
= ALU Register (Left)
= ALU Register (Right)
= Shifter Register (Left or Right)
CLRXX
MIAXX
A2XXX
APBXX
AMBXX
BMAXX
ANX-Y
ORX-Y
XORXY
PASXX
SBFXX
OPXXX
Clear All Registers to zero
Minus A,
XX = Carry in to LSB
A Divided by 2, XXX = Source of MSB
A Plus B,
XX = Carry in to LSB
A Minus B,
XX = Carry in to LSB
B Minus A,
XX = Carry in to LSB
AND
X
= Operand 1, Y = Operand 2
OR
X
= Operand 1, Y = Operand 2
Exclusive OR
X
= Operand 1, Y = Operand 2
Pass
XX = Operand
Set BFP Flag
XX = Function
Output Constant XXX
4
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