MB86330 Datasheet, PDF (27/46 Pages) Fujitsu Component Limited. – 16-bit Fixed-point DSP

MB86330
(2) NOG Mode
In this mode, the CX and DX registers are handled as a 32-bit accumulator in which detected overflow is clipped.
• Fixed-point type multiplication (signed data x signed data)
31 bits of the result of a signed operation are stored into bits 1 to 31 in the accumulator shifted to the left by
one bit. “0” is set at bit 0.
15 14 13 12
S
×S
10
S
31 30 29 28
17 16 15 14
31 bits of an operation result
16 bits
0 ^{16 bits}
0
21 0
32 bits
27