SN8P2606 查看數據表（PDF） - Sonix Technology Co., Ltd

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SN8P2606

8-Bit Micro-Controller

Sonix Technology Co., Ltd 

SN8P2608

8-Bit Micro-Controller

2.1.1.4 JUMP TABLE DESCRIPTION

The jump table operation is one of multi-address jumping function. Add low-byte program counter (PCL) and ACC

value to get one new PCL. If PCL is overflow after PCL+ACC, PCH adds one automatically. The new program counter

(PC) points to a series jump instructions as a listing table. It is easy to make a multi-jump program depends on the

value of the accumulator (A).

’ Note: PCH only support PC up counting result and doesn’t support PC down counting. When PCL is

carry after PCL+ACC, PCH adds one automatically. If PCL borrow after PCL–ACC, PCH keeps value and

not change.

¾ Example: Jump table.

ORG

B0ADD

JMP

JMP

JMP

JMP

0X0100

PCL, A

A0POINT

A1POINT

A2POINT

A3POINT

; The jump table is from the head of the ROM boundary

; PCL = PCL + ACC, PCH + 1 when PCL overflow occurs.

; ACC = 0, jump to A0POINT

; ACC = 1, jump to A1POINT

; ACC = 2, jump to A2POINT

; ACC = 3, jump to A3POINT

SONIX provides a macro for safe jump table function. This macro will check the ROM boundary and move the jump

table to the right position automatically. The side effect of this macro maybe wastes some ROM size.

¾ Example: If “jump table” crosses over ROM boundary will cause errors.

@JMP_A

MACRO

IF

JMP

ORG

ENDIF

ADD

ENDM

VAL

(($+1) !& 0XFF00) !!= (($+(VAL)) !& 0XFF00)

($ | 0XFF)

($ | 0XFF)

PCL, A

’ Note: “VAL” is the number of the jump table listing number.

SONiX TECHNOLOGY CO., LTD

Page 18

Version 1.4

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