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92
Section 9: Program Branching and Controls
Keystrokes
Display
(9](#8]
012-
43 7
Sumsthebitsin the
X-register.
013-
40
Adds this sum to least
significant part of
current checksum. Might
set carry flag.
(xxy]
014-
34
Brings most significant
part of current checksum
into X.
0
015-
0
Places0inX.
(g](RLC]
016-
43 C
PlacesalintoXifa
carry was generated in
the preceding addition.
017-
40
Adds carry bit to most
significant part of
checksum.
(xxy]
018-
34
Returns least significant
part of checksum to X.
(9](bsz]
019-
4323
Decrements the current
register number stored in
R;.
0
020-
22
0
Ifregister numberinR;
is not yet zero, then
continues with loop.
(9](RTN]
021-
43 21
Now, calculate an updated checksum (bit summation) given the
following 4-bit hexadecimal values in R; through Ry:
Ry: A
Ry B
Rs: 3
Ry A
Re: D
Rz:
7
R4:
1
RGI
D
RBI
2
RA:
6
Keystrokes
Display
([STATUS]: 0-04-0000)
(e](P/R]
Returns to Run mode.
A
1
A h
Storethe above values in
:
.
R, through Rj,.
6 (STOJA
6 h
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