PC912XDP512F0MPVR datasheet(253/1348 Pages) FREESCALE

253 / 1348 page

Chapter 6 XGATE (S12XGATEV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

253

Operation

RS.H - IMM8 - C

⇒ NONE, only condition code ﬂags get updated

Subtracts the carry bit and the 8 bit constant IMM8 contained in the instruction code from the high byte of

the source register RD using binary subtraction and updates the condition code register accordingly. The

carry bit and Zero bits are taken into account to allow a 16 bit compare in the form of

CMPL

R2,#LOWBYTE

CPCH

R2,#HIGHBYTE

BCC

; branch condition

Remark: There is no equivalent operation using triadic addressing. Comparing the values of two registers

can be performed by using the subtract instruction with R0 as destination register.

CCR Effects

Code and CPU Cycles

CPCH

Compare Immediate 8 bit Constant with

Carry (High Byte)

CPCH

∆∆∆∆

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

Set if the result is $00 and Z was set before this operation; cleared otherwise.

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

RS[15] & IMM8[7] & result[15] | RS[15] & IMM8[7] & result[15]

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

RS[15] & IMM8[7] | RS[15] & result[15] | IMM8[7] & result[15]

Source Form

Address

Mode

Machine Code

Cycles

CPCH RD, #IMM8

IMM8

PC912XDP512F0MPVR 데이터시트(PDF) 253 Page - Freescale Semiconductor, Inc