Maxim-integrated MAXQ622 Manual do Utilizador descarregar pdf (Página 234)

MAXQ612/MAXQ622 User’s Guide

16-24 Maxim Integrated

SRA4 Operation:

15 Active Accumulator (Acc) 0 Carry Flag

→ → →

Acc.[11:0] ← Acc.[15:4]

Acc.[15:12] ← Acc.15

C ← Acc.3

Encoding:

1000 1010 1011 1010

Example(s):

; Acc = 9878h, C=0, Z=0

SRA4 ; Acc = F987h, C=1, Z=0

SRA4 ; Acc = FF98h, C=0, Z=0

SUB/SUBB src Subtract/Subtract with Borrow

Description:

Subtracts the specified src from the active accumulator (Acc) and returns the result back to the active

accumulator. The SUBB additionally subtracts the borrow (Carry Flag) which may have resulted from

previous subtraction. For the complete list of src specifiers, reference the MOVE instruction. The

PFX[n] register may be used to supply the high byte of data for 8-bit sources.

Status Flags:

C, S, Z, OV

SUB

Operation:

Acc ← Acc – src

Encoding:

f101 1010 ssss ssss

Example(s):

; Acc = 2345h to start, A[1]= 1250h

SUB A[1] ; Acc = 10F5h, C=0, S=0, Z=0, OV=0

SUB A[1] ; Acc = FEA5h, C=1, S=1, Z=0, OV=0

SUB A[2] ; A[2] =7FFFh

; → Acc = 7EA6h; C=0, S=0, Z=0, OV=1

SUBB

Operation:

Acc ← Acc – (src + C)

Encoding:

f111 1010 ssss ssss

Example(s):

; Acc = 2345h, A[1]= 1250h, C=1

SUBB A[1] ; Acc = 10F4h, C=0, S=0, Z=0

SUBB A[1] ; Acc = FEA4h, C=1, S=1, Z=0

Special Notes:

The active accumulator (Acc) is not allowed as the src for these operations.

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