SN8P1602A datasheet(30/76 Pages) SONIX

30 / 76 page

SN8P1602B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 30

Version 1.1

ONE ADDRESS SKIPPING

There are nine instructions (CMPRS, INCS, INCMS, DECS, DECMS, BTS0, BTS1, B0BTS0, B0BTS1) with one

address skipping function. If the result of these instructions is true, the PC will add 2 steps to skip next instruction.

If the condition of bit test instruction is true, the PC will add 2 steps to skip next instruction.

B0BTS1

; To skip, if Carry_flag = 1

JMP

C0STEP

; Else jump to C0STEP.

C0STEP:

NOP

B0MOV

A, BUF0

; Move BUF0 value to ACC.

B0BTS0

; To skip, if Zero flag = 0.

JMP

C1STEP

; Else jump to C1STEP.

C1STEP:

NOP

If the ACC is equal to the immediate data or memory, the PC will add 2 steps to skip next instruction.

CMPRS

A, #12H

; To skip, if ACC = 12H.

JMP

C0STEP

; Else jump to C0STEP.

C0STEP:

NOP

If the destination increased by 1, which results overflow of 0xFF to 0x00, the PC will add 2 steps to skip next

instruction.

INCS instruction:

INCS

BUF0

JMP

C0STEP

; Jump to C0STEP if ACC is not zero.

…

C0STEP:

NOP

INCMS instruction:

INCMS

BUF0

JMP

C0STEP

; Jump to C0STEP if BUF0 is not zero.

…

C0STEP:

NOP

If the destination decreased by 1, which results underflow of 0x00 to 0xFF, the PC will add 2 steps to skip next

instruction.

DECS instruction:

DECS

BUF0

JMP

C0STEP

; Jump to C0STEP if ACC is not zero.

…

C0STEP:

NOP

DECMS instruction:

DECMS

BUF0

JMP

C0STEP

; Jump to C0STEP if BUF0 is not zero.

…

C0STEP:

NOP

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