P912XDP512F0MPVR datasheet(281/1348 Pages) FREESCALE

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Chapter 6 XGATE (S12XGATEV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

281

Operation

RD – IMM8:$00

⇒ RD

Subtracts a signed immediate 8 bit constant from the content of high byte of register RD and using binary

subtraction and stores the result in the high byte of destination register RD. This instruction can be used

after an SUBL for a 16 bit immediate subtraction.

Example:

SUBL

R2,#LOWBYTE

SUBH

R2,#HIGHBYTE

; R2 = R2 - 16 bit immediate

CCR Effects

Code and CPU Cycles

SUBH

Subtract Immediate 8 bit Constant

(High Byte)

SUBH

∆∆∆∆

Set if bit 15 of the result is set; cleared otherwise.

Set if the result is $0000; cleared otherwise.

Set if a two´s complement overﬂow resulted from the operation; cleared otherwise.

RD[15]old & IMM8[7] & RD[15]new | RD[15]old & IMM8[7] & RD[15]new

Set if there is a carry from the bit 15 of the result; cleared otherwise.

RD[15]old & IMM8[7] | RD[15]old & RD[15]new | IMM8[7] & RD[15]new

Source Form

Address

Mode

Machine Code

Cycles

SUBH RD, #IMM8

IMM8

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