Motorola DSP56800 Manual page 394

SUB
Data ALU
Operation
Operation Registers
SUB
Timing:
2 + mv oscillator clock cycles for SUB instructions with a parallel move
Refer to previous tables for SUB instructions without a parallel move
Memory: 1 program word for SUB instructions with a parallel move
Refer to previous tables for SUB instructions without a parallel move
A-164
Subtract
First and Second Memory
Read1
X0,A X:(R0)+
Y1,A X:(R0)+N
Y0,A
X:(R1)+
X0,B X:(R1)+N
Y1,B
Y0,B
DSP56800 Family Manual
Reads
Read2 Destination1
X:(R3)+
X:(R3)-
Valid
destinations
for Read1
SUB
Destinations for Memory
Reads
Destination2
Y0 X0
Y1 X0
Valid
destinations
for Read2