Calculator User Manual

BANZ Branch on Auxiliary Register Not Zero
7-42
Example 1 BANZ PGM0 ;(PGM0 labels program address 0)
Before Instruction After Instruction
ARP 0 ARP 0
AR0 5h AR0 4h
Because the content of AR0 is not zero, the program branches to program ad-
dress 0 is loaded into the program counter (PC), and the program continues
executing from that location. The default auxiliary register operation is a decre-
ment of the current auxiliary register content; thus, AR0 contains 4h at the end
of the execution.
or
Before Instruction After Instruction
ARP 0 ARP 0
AR0 0h AR0 FFFFh
Because the content of AR0 is zero, the branch is not executed; instead, the
PC is incremented by 2, and execution continues with the instruction following
the BANZ instruction. Because of the default decrement, AR0 is decremented
by 1, becoming –1.
Example 2 MAR *,AR0 ;Set ARP to point to AR0.
LAR AR1,#3 ;Load AR1 with 3.
LAR AR0,#60h ;Load AR0 with 60h.
PGM191 ADD *+,AR1 ;Loop: While AR1 not zero,
BANZ PGM191,AR0 ;add data referenced by AR0
;to accumulator and increment
;AR0 value.
The contents of data-memory locations 60h–63h are added to the accumula-
tor.