C8051F360 datasheet(121/288 Pages) SILABS

121 / 288 page

Rev. 1.0

121

C8051F360/1/2/3/4/5/6/7/8/9

11.7.2. Multiply Only Example

The example below implements the equation:

4660

292

–

1360720

–

MOV

MAC0CF, #01h

; Use integer numbers, and multiply only mode (add to zero)

MOV

MAC0AH, #12h

; Load MAC0A register with 1234 hex = 4660 decimal

MOV

MAC0AL, #34h

MOV

MAC0BH, #FEh

; Load MAC0B register with FEDC hex = -292 decimal

MOV

MAC0BL, #DCh

; This line initiates the Multiply operation

NOP

; After this instruction, the Accumulator should be equal to

; FFFFEB3CB0 hex = -1360720 decimal. The MAC0STA register should

; be 0x01, indicating a negative result.

NOP

; After this instruction, the Rounding register is updated

11.7.3. MAC0 Accumulator Shift Example

The example below shifts the MAC0 accumulator left one bit, and then right two bits:

MOV

MAC0OVR, #40h

; The next few instructions load the accumulator with the value

MOV

MAC0ACC3, #88h

; 4088442211 Hex.

MOV

MAC0ACC2, #44h

MOV

MAC0ACC1, #22h

MOV

MAC0ACC0, #11h

MOV

MAC0CF, #20h

; Initiate a Left-shift

NOP

; After this instruction, the accumulator should be 0x8110884422

NOP

; The rounding register is updated after this instruction

MOV

MAC0CF, #30h

; Initiate a Right-shift

MOV

MAC0CF, #30h

; Initiate a second Right-shift

NOP

; After this instruction, the accumulator should be 0xE044221108

NOP

; The rounding register is updated after this instruction

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