Freescale Semiconductor MC9S12XDP512 SBC Subtract with Carry SBC

Chapter 9 XGATE (S12XGATEV2)
MC9S12XDP512 Data Sheet, Rev. 2.11
Freescale Semiconductor 465
Operation
RS1 - RS2 - C ⇒ RD
Subtracts the content of register RS2 and the value of the Carry bit from the content of register RS1 using
binary subtraction and stores the result in the destination register RD. Also the zero flag is carried forward
from the previous operation allowing 32 and more bit subtractions.
Example:
SUB R6,R4,R2
SBC R7,R5,R3 ; R7:R6 = R5:R4 - R3:R2
BCC ; conditional branch on 32 bit subtraction
CCR Effects
Code and CPU Cycles
SBC Subtract with Carry SBC
NZVC
∆∆∆∆
N: Set if bit 15 of the result is set; cleared otherwise.
Z: Set if the result is $0000 and Z was set before this operation; cleared otherwise.
V: Set if a two´s complement overflow resulted from the operation; cleared otherwise.
RS1[15] & RS2[15] & RD[15]new | RS1[15] & RS2[15] & RD[15]new
C: Set if there is a carry from bit 15 of the result; cleared otherwise.
RS1[15] & RS2[15] | RS1[15] & RD[15]new | RS2[15] & RD[15]new
Source Form Address
Mode Machine Code Cycles
SBC RD, RS1, RS2 TRI 0 0 0 1 1 RD RS1 RS2 0 1 P