Maxim Integrated MAXQ622 - Manual (Page 217)

MAXQ612/MAXQ622 User’s Guide
Maxim Integrated 16-7
Encoding: 15 0
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]
register is used to supply the high byte of a 16-bit immediate address for the absolute JUMP . Using
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: 15 0
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