Sharp CE-150 - Page 286

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@ BCH (B ranCH)
Jun1ps to a nC\v program step \vhich .i is indicat ed by t he prog ran1 counter of \vhi cJ ·l val ue
is addcd/s ub 1 rnc1cd by the val ue of t he imm ediate data i .j. It wi ll be poss ible to jump
within a r:m gc of- 255< i< 255 .
No change takes place in fl ags.
• 1- · or n 1:.1.t
BCH+i
BCH- i
(EX) B CH +S
Exe cu te
P= 4 00 2H --> P- 400 7H
• Operation
P + i - ·P
f> - i - J>
As soon as 1 11e BCH inslruction is r ead .
;he program co unter be co mes
.. P= 4002 H". and aft er execution oi l he
SC H instructio n. the next pr ogr am
exe
cu tion starts f ro rn the address 4007H.
L
.. .
I
L
I
,r-
f-
~ -
@ BCS ( Br anch ii C Se t)
c·onditional re lati\'(' addre ss j1 n 11p .
When C= 1. it jumps to a program s te p rep resent ed by th e prog ram counter of wh ich
va iuc is ad dc d/s ub1rac 1 ed with the value of the immedia te data.
If (' =O. the control proceeds directly t <> a next pr ogran t step \Vithout cau si ng jurnp.
N< > change ta k ('~ pla t(' in nags.
• Format
BCS +i
• Operation
c -j l: P +i - P
0: P 1101 changed.
c-l l: P - i -· P
0: I' 110 1 changed.
BCS - i
(E X) 6CS+5
E xe.c u te
P- 400 2H -- · P= 4007H
C- 1
As s oo n as the BCS inst ru ction 1s read.
1hc
progr am counter becomes
.. P= 4002H .. . If C= 1 at that p oi nt. ne xt
program execution starts fr om the
address 4007H. If C=O. it stflrts fro1n
4002H.
uc - 1
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