Maxim-integrated MAXQ622 Manual do Utilizador descarregar pdf (Página 217)

MAXQ612/MAXQ622 User’s Guide

Maxim Integrated 16-7

Encoding:

f10n

1101 ssss ssss

Example(s):

MOVE LC[1], #10h ; counter = 10h

Loop:

ADD @DP[0]++ ; add data memory contents to Acc, post-inc DP[0]

DJNZ LC[1], Loop ; 16 times before falling through

{L/S} JUMP src Unconditional {Long/Short} Jump

Description:

Performs an unconditional jump as determined by the src specifier. The JUMP instruction uses an

8-bit immediate src to perform a relative jump (IP +127/-128 words). The JUMP instruction uses

a 16-bit immediate src to perform an absolute JUMP to the specified 16-bit address. The PFX[0]

the optional ‘L’ prefix (i.e. LJUMP) will result in an absolute long jump and use of the PFX[0] register.

Using the optional ‘S’ prefix (i.e. SJUMP) will attempt to generate a relative short jump, but will be

flagged by the assembler if the destination is out or range. Specifying an internal register src (no

matter whether 8-bit or 16-bit) always produces an absolute JUMP to a 16-bit address, thus the ‘L’

and ‘S’ prefixes should not be used. The PFX[n] register value is used to supply the high address

byte when an 8-bit register src is specified.

Status Flags:

None

Operation:

IP ← src

Absolute JUMP

IP ← IP + src

Relative JUMP

Encoding:

f000

1100 ssss ssss

Example(s):

JUMP label1 ; relative jump to label1 (must be within range

; IP +127/-128 words)

JUMP label1 ; absolute jump to label1= 0400h

; MOVE PFX[0], #04h

; JUMP #00h

JUMP DP[0] ; absolute jump to addr16 DP[0]

JUMP M0[0] ; assume M0[0] is an 8-bit register

; absolute jump to addr16

; high(addr16)=00h (PFX[0])

; low (addr16)=M0[0]

LJUMP label1 ; label=0120h and is relative to this instruction

; absolute jump is forced by use of ‘L’ prefix

; MOVE PFX[0], #01h

; JUMP #20h

SJUMP label1 ; relative offset for label1 calculated and used

; if label1 is not relative, assembler will generate an

; error

SJUMP #10h ; relative offset of #10h is used directly by the JUMP

1 2 ... 212 213 214 215 216 217 218 219 220 221 222 ... 254 255

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